Control of discharge amount
If the swash plate angle (a) becomes larger, the difference between volumes (E) and (F) becomes larger and pump delivery (Q) increases.
If the swash plate angle (a) becomes larger, the difference between volumes (E) and (F) becomes larger and pump delivery (Q) increases.
Servo piston (12) is used for changing swash plate angle (a).
Servo piston (12) carries out linear reciprocal movement according to the signal pressure from the PC and LS valves.
This linear movement is transmitted to rocker cam (4) via slider (13).
Being supported by cradle (2) on the cylindrical surface, rocker cam (4) slides on the surface while continuing revolving movement.
Space of the pressure receiving area of servo piston (12) are not identical on the left side and right side. Main pump discharge pressure (self pressure) (PP) is always brought to the pressure chamber of the small diameter piston side.
Output pressure (PEN) of the LS valve is brought to the chamber receiving the pressure at the large diameter piston end.
The relationship in the size of pressure (PP) at the small diameter piston end and pressure
(PEN) at the large diameter piston end, and the ratio between the area receiving the pressure of the small diameter piston and the large diameter piston controls the movement of servo piston (12)
(PEN) at the large diameter piston end, and the ratio between the area receiving the pressure of the small diameter piston and the large diameter piston controls the movement of servo piston (12)
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