lf swash plate angle a becomes larger, the difference in volumes E and F becomes larger and discharge volume Q increasesấ Svvash plate angle a is changed by servo piston (12).
Servo piston (12) moves in a reciprocal movement («->) according to the command from the control valve.
This straight line movement is transmitted through rod (15) to rocker cam (4), and rocker cam (4), vvhich is supported by the cylindri- cal surtace to cradle (2), moves in a rocking movement on the cylindrical surface in (t direction).
With servo piston (12), the area receiving the pressure is different on the left and right, so main pump discharge pressure (self pres- sure) pp is always connected to the cham- ber receiving the pressure on the smalỉ di- ameter piston side (the self-pressure is brought in). 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 self-pres- sure pp and the pressure at the small diam- eter piston end, and the ratio betvveen the area receiving the pressure at the small di- ameter piston end and the large diameter piston end Controls the movement of servo piston
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