HYDRAULIC SYSTEM FOR WORKING MACHINE

摘要

A hydraulic system includes: hydraulic actuators; a control valve for controlling the hydraulic actuators; a tank for storing a hydraulic operation fluid; a variable displacement pump for supplying the hydraulic operation fluid to the hydraulic actuators; a regulator for controlling the variable displacement pump; a pilot pump for discharging a hydraulic pilot fluid; a load sensing system for maintaining a differential pressure to be a constant pressure, the differential pressure being obtained by subtracting a second signal pressure from a first signal pressure that is the discharge pressure of the variable displacement pump, the second signal pressure being the maximum one of the load pressures generated in the hydraulic actuators; a signal tube for sending the second signal pressure to the regulator; a throttle provided on the signal tube; and a warm-up circuit for supplying the hydraulic pilot fluid to a downstream side of the throttle.

主权项

1. A hydraulic system for a working machine, comprising:
a plurality of hydraulic actuators; a control valve configured to control the hydraulic actuators; a tank configured to store a hydraulic operation fluid; a variable displacement pump configured to discharge the hydraulic operation fluid stored in the tank to supply the hydraulic operation fluid to the hydraulic actuators; a regulator configured to control the variable displacement pump; a pilot pump configured to discharge a hydraulic pilot fluid; a load sensing system configured to control a discharge pressure of the variable displacement pump with use of the regulator to maintain a differential pressure to be a constant pressure, the differential pressure being obtained by subtracting a second signal pressure from a first signal pressure that is the discharge pressure of the variable displacement pump, the second signal pressure being the maximum one of the load pressures generated in the hydraulic actuators; a signal tube provided extending from the control valve to the regulator, the signal tube being configured to send the second signal pressure to the regulator; a throttle provided on the signal tube; and a warm-up circuit configured to supply the hydraulic pilot fluid to a downstream side of the throttle provided on the signal tube.