Patent ID: 11879452
Assignee: KYB CORPORATION
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A pump displacement control device for controlling a displacement of a pump, the pump displacement control device comprising:
a servo piston configured to change a tilt angle of the pump;
a flow rate control spool configured to be displaced corresponding to an input pressure;
a power control spool configured to be displaced corresponding to a discharge pressure of the pump;
a control pressure regulating spool configured to regulate a control pressure which controls the servo piston in accordance with an amount of displacement of the flow rate control spool or an amount of displacement of the power control spool; and
a feedback lever configured to selectively abut on the flow rate control spool or the power control spool, and directly connecting the servo piston to the control pressure regulating spool such that the feedback lever directly feeds back an amount of displacement of the servo piston to the control pressure regulating spool by abutting on either one of the flow rate control spool or the power control spool, whereby the control pressure regulating spool regulates the control pressure.