Baker Botts, LLP
Construction machine having swing body
Disclosed is a hybrid-type construction machine equipped with a swing hydraulic motor 27 and a swing electric motor 25 in combination to save energy, the construction machine ensuring high operability of a swing body 20 and providing high energy efficiency. In accordance with the amount of manipulation of a swing control lever 72, the construction machine changes a rate of a torque of the swing electric motor 25 with respect to that of the swing hydraulic motor 27. The construction machine also controls a relief pressure and the torque of the swing electric motor 25 in accordance with the amount of manipulation of a swing control lever 72, a pressure of the swing hydraulic motor 27, and a rotating speed of the swing electric motor 25. 
Hitachi Construction Machinery Co., Ltd.
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Kouji Shinya Seiji Takatoshi Hidetoshi Yusuke Manabu
Ishikawa Imura Ishida Ooki Satake Kajita Edamura