When the discharge pressure exceeds the set value
of the spring (7), the swash plate (4) is pushed by
the pistons (9) and (10), the inclination decreases,
and the swash plate is kept at an inclination where
the discharge pressure and the spring force are bal-
anced.
When
the pressure acting onto the pistons (9) and
(10) increases still further, the inclination of the
swash plate (4) becomes still smaller. The until now
inactive spring (8) also becomes active, and a still
higher discharge pressure will be required to coun-
teract this spring force.
In
this way, the inclination of the swash plate (4)
is changed, the discharge quantity is controlled, the
pump is supplied only with the pressure and the flow
volume required for the load, and the pump loss
pressure is reduced.
As
the inclination of the swash plate (4) changes
not only according to the operation pressure of the
pumps P1 and P2, but also according to the opera-
tion
pressure of the pump P3, the P-Q curve of the
piston pump becomes a curve with effective use of
the engine power (full power control).
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