Crowell & Moring LLP
Hybrid-type construction machine
Provided is a hybrid-type construction machine including a swing device of the hydraulic-electric combined swing type and by which, in a work for which accurate swing operability is demanded like, for example, a crane work, a swing body is driven alone by the electric motor.The hybrid-type construction machine includes an engine, a hydraulic pump driven by the engine, a swing body, an electric motor for driving the swing body, and a hydraulic motor driven by the hydraulic pump for driving the swing body. The swing body is swung by simultaneous drive by the electric motor and the hydraulic motor. The hybrid-type construction machine includes a control apparatus having a work mode changeover unit by which an operator changes over a mode in response to an aspect of a work and an electric alone swing controlling unit configured to control the swing body to be swung by the electric motor alone. When a work in which position accuracy is demanded is selected by the work mode changeover unit, the swing body is swung by the electric alone swing controlling unit.
Hitachi Construction Machinery Co., Ltd.
B E E E E E E
B60Y E02F E02F E02F E02F E02F E02F
additional inventional inventional additional inventional inventional inventional
Shiho Hiroaki Hidetoshi Shinji Kouji Tomoaki Shinya
Izumi Amano Satake Nishikawa Ishikawa Kaneta Imura