In this pump, the pistons are at an angle
to the drive shaft and Thrust Plate. The piston block shaft is connected to the
drive shaft by a universal joint, not shown. The drive shaft, thrust plate, piston
block shaft, and piston block all revolve.
The connecting rods are attached
to the thrust plate and revolve with it, unlike the swash plate pump where the
piston rods slide past a stationary swash plate.
The outlet ports are semi-circular
holes in the Valve Plate, shown on the far right of the animation on edge and
in a head-on view below, right.
As the pump revolves, half the pistons suck
in fluid as they pass over the intake port. The other pistons discharge their
fluid through the outlet port.
This pump should be compared to the radial
piston pump, swash plate pump, and wobble