Kobelco Construction Machinery Co., Ltd.

Kobe Steel, Ltd.

Fumikazu Higuchi

Masaaki Murakami

Kaoru Adachi

Hiroshi Kanamaru

Hironori Tsukamoto

Jumpei Yokota

Tsuyoshi Noda

Daisuke Mochizuki

Koji Fujikawa

Masaru Ito

Yutaka Tohji

Kazuharu Tajima

Power shovel

Console box for construction machine

Rear cover for construction machine

Counterweight for construction machine

A hydraulic control apparatus for a working machine in which a flow rate and a direction of pressure oil discharged from a hydraulic pump are controlled by a control valve to supply it to a swing motor, comprising: a bleed-off oil path for bleeding off a part of the pressure oil supplied to the swing motor, a cut valve provided on the bleed-off oil path to adjust a bleed-off amount, a controller for controlling the cut valve through a solenoid proportional valve, and pressure sensors for detecting an operating amount of a remote control valve for swing, characterized in that the controller sets the bleed-off amount according to the operating amount detected by the pressure sensors, controls an opening area of the cut valve on the basis of the bleed-off amount set, and suppresses the shock when sudden swinging operation takes place.

Hydraulic control device of a working machine

Growing community of inventors

Hiroshima, Japan

Fumikazu Higuchi