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10 Structure, function and maintenance standard
Operation of pump
•
Cylinder block (7) rotates together with shaft (1),
and shoe (5) slides on flat surface (A).
•
When this happens, rocker cam (4) moves along
cylindrical surface (B), so angle (a) between
center line (X) of rocker cam (4) and the axial di-
rection of cylinder block (7) changes.
•
Angle (a) is called the swash plate angle.
•
With center line (X) of rocker cam (4) at swash
plate angle (a) in relation to the axial direction of
cylinder block (7), flat surface (A) acts as a cam
in relation to shoe (5).
•
In this way, piston (6) slides on the inside of cyl-
inder block (7), so a difference between volumes
(E) and (F) is created inside cylinder block (7).
•
A single piston (6) sucks and discharges the oil
by the amount (F) – (E).
•
As cylinder block (7) rotates and the volume of
chamber (E) becomes smaller, the pressurized
oil is discharged.
•
On the other hand, the volume of chamber (F) grows
larger and, in this process, the oil is suctioned.
•
As center line (X) of rocker cam (4) matches the
axial direction of cylinder block (7) (swash plate
angle = 0), the difference between volumes (E)
and (F) inside cylinder block (7) becomes 0.
•
Suction and discharge of pressurized oil is not
carried out in this state. Namely pumping action
is not performed. (Actually, however, the swash
plate angle is not set to 0)
PC800, 850-8
SEN00383-03
11
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