2-3
The cylinder block is connected via spline and can rotate together with the drive shaft.
The piston assembled into the cylinder block performs reciprocal operation while following the
swash plate on the hanger.
The piston moves in a direction to increase the displacement during a stroke from the lower to the
upper dead points. The oil flows from the suction port via a port plate into the cylinder
block(suction process).
During a stroke from the upper to the lower dead points, the piston moves in a direction to
decrease the displacement. The oil is discharged to the discharge port(discharge process).
The displacement can be changed by changing the tilting of the hanger(swash plate).
The oil sucked through the port in the cylinder block is discharged from the discharge port in the
control plate.
The oil sucked through the port on the outside of the cylinder block is discharged from the
discharge port on the outside of the control plate.
PRINCIPLE OF OPERATION
Function of pump
Bottom dead point
Suction port
Control plate
Cylinder block
Piston
Swash plate
(sliding surface)
Delivery port
Outside
P1
Inside
P2
Top dead point
Delivery process
Suction process
d
a
S
1)
(1)
R35Z72MP05
ɷ
Displacement q(cm
2
)
q=
ӕ
Ý
d
2
/4
Ý
tan
ɷ
Ý
D
Ý
Z/2
Ý
10
-3
tan
ɷ
Ý
D : Strokes
Z : Number of piston
