ELECTRIC CONSTRUCTION MACHINE

WIPO Patent Application WO/2012/114794

A1

An electric construction machine, which is capable of preventing charging difficulties due to the disappearance of the remaining amount of electricity stored in a battery device, is provided. An electric hydraulic excavator, provided with an electric motor (31), a hydraulic pump (33) that is driven by the electric motor (31), hydraulic actuators (13A, 13B, 19 to 21, etc.) that are driven by hydraulic oil from the hydraulic pump (33), and a battery device (7) which is the power source for the electric motor (31), wherein the battery device (7) has battery systems (56A, 56B), each of which comprises a plurality of batteries (55). A selector switch (28) enables one of the battery systems (56A, 56B) to be selected. An arithmetic and control unit (53) of an inverter device (32) controls switches for switching connections (58A, 58B) via battery controllers (54A, 54B), and switches the connection state of the battery systems (56A, 56B) in such a manner that electricity is supplied to the electric motor (31) from the battery system (56A or 56B) selected by the selector switch (28).

JPS616557	[Title of the device] The hydraulic circuit of a hydraulic wheel shovel
JP5461795	Drive system for hybrid construction machinery
JPH11351007	ROTATIONAL FREQUENCY CONTROL DEVICE AND METHOD FOR PRIME MOVER OF WORKING VEHICLE

YUNOUE MASAYUKI (JP)
NOGUCHI AKIRA (JP)
TAKISHITA TATSUO (JP)
KURIKUMA HAJIME (JP)

PCT/JP2012/050999

August 30, 2012

January 18, 2012

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HITACHI CONSTRUCTION MACHINERY (JP)
YUNOUE MASAYUKI (JP)
NOGUCHI AKIRA (JP)
TAKISHITA TATSUO (JP)
KURIKUMA HAJIME (JP)

E02F9/20; E02F9/00

JP2008189215A	2008-08-21
JP2001011888A	2001-01-16
JPH09298806A	1997-11-18
JP2009189086A	2009-08-20

See also references of EP 2679734A4

KASUGA Yuzuru (JP)
Kasuga 讓 (JP)

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