WORKING MACHINE - HITACHI CONSTRUCTION MACHINERY

Title:

WORKING MACHINE

Document Type and Number:

WIPO Patent Application WO/2015/030143

Kind Code:

A1

Abstract:

Provided is a working machine that uses a hydraulic motor and an electric motor to drive a turning body, wherein, when the turning operation load is small, etc., the fuel consumption in regions in which the turning efficiency from the hydraulic motor deteriorates can be reduced. The working machine is provided with an engine, a hydraulic pump that is driven by the engine, the turning body, the electric motor for driving the turning body, the hydraulic motor that is driven by the hydraulic pump and is for driving the turning body, and an operation lever device for turning, which commands the drive of the turning body. The working machine includes a control device that controls, on the basis of the operation load of the operation lever device and/or the turning speed of the turning body, using either an electric turning mode in which the turning body is mainly driven by torque from the electric motor, or a hydraulic turning mode in which the turning body is mainly driven by torque from the hydraulic motor.

Inventors:

IMURA SHINYA (JP)
ISHIKAWA KOUJI (JP)
NISHIKAWA SHINJI (JP)
KANETA TOMOAKI (JP)
IZUMI SHIHO (JP)
SATAKE HIDETOSHI (JP)

Application Number:

PCT/JP2014/072650

Publication Date:

March 05, 2015

Filing Date:

August 28, 2014

Export Citation:

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Assignee:

HITACHI CONSTRUCTION MACHINERY (JP)

International Classes:

E02F9/20

Domestic Patent References:

WO2012157510A1

2012-11-22

Foreign References:

JP2008297754A	2008-12-11
JP2005290882A	2005-10-20
JP2011241653A	2011-12-01

Other References: