8
Through drive
9
Valve plate
10 Top dead centre TDC
11 Bottom dead centre BTC
12 Control slots in suction side of swash plate (for sense of rota-
tion shown)
13 Control slot on pressure side
Driven by the engine, the drive shaft rotates and drives the cylinder
via a splined connection. The cylinder rotates with the drive shaft
and drives the 9 pistons. The pistons rest with their slipper pads on
the sliding face of the swashing cradle and perform an axial move-
ment. The slipper pads are held on the sliding face and are posi-
tively guided by a retaining device. During a complete rotation of
the cylinder block each piston moves through the bottom and top
dead centre back to its initial position. From dead centre to dead
centre is performs a full piston stroke. During this process the flow
volume determined by the stroke is drawn in through the control
slots in the valve plate or pumped out. During the suction stroke
the hydraulic fluid is drawn into the increasing piston chamber, i.e.
it is actually pressed in. On the opposite side the oil is pressed out
of the piston bores into the hydraulic system during the compres-
sion stroke.
Hydraulic system – Basic principles
BW 900-50
100
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