ELECTRO-HYDRAULIC DRIVE SYSTEM FOR A WORK MACHINE

Title:

ELECTRO-HYDRAULIC DRIVE SYSTEM FOR A WORK MACHINE

Document Type and Number:

WIPO Patent Application WO/2012/023231

Kind Code:

A1

Abstract:

Disclosed is an electro-hydraulic drive system for a work machine, allowing efficient operation by means of oil pressure and electricity. Said drive system, which adjusts the flow rate of a hydraulic fluid by means of a control valve (6) and drives an upper rotating body (16), comprises: an electro-hydraulic pump (3) that has a hydraulic pump (4), which is driven by an engine (2), and a first electric motor (5); and an electro-hydraulic motor (9) that has a hydraulic motor (10), which is rotated by a hydraulic fluid supplied by the electro-hydraulic pump (3), and a second electric motor (11). The disclosed drive system is provided with a control device (7) that determines the operating states of the first electric motor (5) and second electric motor (11) from the load on the electro-hydraulic pump (3) and the load on the electro-hydraulic motor (9).

Inventors:

YAMADA MASAHIRO
YAMAMOTO RYO
IMAMURA YUKITO

Application Number:

PCT/JP2011/004017

Publication Date:

February 23, 2012

Filing Date:

July 13, 2011

Export Citation:

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Assignee:

KAWASAKI HEAVY IND LTD (JP)
YAMADA MASAHIRO
YAMAMOTO RYO
IMAMURA YUKITO

International Classes:

B60K6/12; F15B21/14; E02F9/20; F03C1/40; F04B49/00; F04B49/06; H02P5/00

Foreign References:

JP2004360216A	2004-12-24
JPH1042587A	1998-02-13
JP2005237178A	2005-09-02
JP2007218003A	2007-08-30
JP2002275945A	2002-09-25
JP2004124381A	2004-04-22
JP2005290882A	2005-10-20
JP2007056998A	2007-03-08
JP2008291522A	2008-12-04
JPH10103112A	1998-04-21
JP2009209725A	2009-09-17
JP2011144531A	2011-07-28
JP2005237178A	2005-09-02
JP2003009308A	2003-01-10
JP2007218003A	2007-08-30
JP2002275945A	2002-09-25

Other References: