4. Function of pump 1) Pump Torque and rotational speed are applied to the drive shaft ( 1 ) by an engine. The drive shaft is connected by splines to the cylinder ( 10 ) to set this in motion. With every revolution, the pistons ( 11 ) in the cylinder bores execute one stroke whose magnitude depends on the setting of the swashplate ( 13 ). The pistons hold the slipper pads ( 12 ) onto the glide surface of the swashplate with the retaining plate ( 3 ) and guide them along. The swashplate setting during a rotation causes each piston to move over the bottom and top dead centers and back to its initial position.
Here, hydraulic fluid is fed in and drained out through the two control slots in the control plate ( 7 ) according to the stroke displacement. On the suction side ( 9 fluid flows into the piston chamber as the piston recedes. At the same time, on the high-pressure ) hydraulic side ( 6 ) the fluid is pushed out of the cylinder chamber into the hydraulic system by the pistons. 4 5 3 2 6 1 7 8 9 13 10 12 11 2-5