| 摘要 |
The present invention is a control device for a variable displacement hydraulic pump by which the absorption horsepower of the hydraulic pump increases with excellent responsiveness and ON / OFF operations of a cut-off control of the greatest pressure can be selected. To this end, a hydraulic pump (2), a slow return valve (25) and a switching valve (24) placed parallel to each other at a pipe line connecting a servo piston (4) and a servo valve (5), a solenoid valve (26) for controlling the pilot pressure of the switching valve (24), and an on/off operation selectable indicating means (30) connected to a control device (10) are included, and the controlling device (10) outputs a command signal to the solenoid valve (26) when the indicating means (30) is switched on to delay the operation speed of a swash plate angle of the hydraulic pump (2). <IMAGE> |
