Daikin Industries, Ltd.

Shigetoshi Shimoo

Toshiyuki Sakai

A hydraulic excavator includes a rotation motor () for rotating an upper rotating structure. The rotation motor () includes an electric motor (), a hydraulic motor (), and a reduction gearbox (). The hydraulic motor () includes a motor mechanism () and a clutch mechanism (). The motor mechanism (), which is a vane-type hydraulic motor, is engaged with/disengaged from a motor shaft () by the clutch mechanism (). When rotation speed of the upper rotating structure is low, and a required value of output torque of the rotation motor () is high, an operation of driving the output shaft () by the hydraulic motor () is performed in the rotation motor ().

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Osaka, Japan

Shigetoshi Shimoo