Hitachi Construction Machinery Co., Ltd.

Hitachi Industrial Equipment Systems Co., Ltd.

Atsushi Tanaka

Hirohisa Tanaka

Takatoshi Ooki

Masami Ochiai

Takashi Kanai

Yutaka Watanabe

Takeshi Obata

Morio Oshina

Tadahiro Shimozono

Nobuo Uzawa

Yoshiomi Jojima

A swing drive system for a construction machine enhances safety for an operator. A swing control meansA has a lever input amount-torque tableand an actual rotating speed-torque table. Based on a lever input amount and an actual rotating speed of an electric motor, the tables are used to derive torque values. A minimum value of the torque values is taken as the acceleration torque. The swing control meansA further has a lever input amount-meter-out restriction area tableand an actual rotating speed-relief torque table. Based on the lever input amount and the actual rotating speed of the electric motor, a meter-out restriction area is derived from the lever input amount-meter-out restriction area table and the actual rotating speed to calculate a meter-out torque. A minimum value of the meter-out torque and relief torque is taken as the braking torque.

Swing drive system for construction machine

Hydraulic drive system

Growing community of inventors

Tsuchiura, Japan

Atsushi Tanaka