Patent ID: 6148548
Filing Date: 2000-11-21
Classification: E02F

Abstract:
A construction machine comprising:two hydraulic pumps;right and left traveling motors for causing the construction machine to travel;work machine actuators for actuating a work machine of the construction machine;a control valve which makes control so that a hydraulic oil discharged from said two hydraulic pumps is fed to at least either said right and left traveling motors or said work machine actuators and so that when a traveling operation and a work machine operation are performed simultaneously, the hydraulic oil discharged from one of said two hydraulic pumps is fed to said traveling motors and the hydraulic oil from the other hydraulic pump is fed to said work machine actuators, said control valve providing communication between said two hydraulic pumps through a pump communication path;drive signal detecting means which detects drive signals with respect to said two hydraulic pumps when the traveling operation and the work machine operation are performed simultaneously; anda controller which controls said control valve so as to throttle or close said pump communication path in accordance with the drive signals detected by said drive signal detecting means.