HYDRAULIC CONTROL DEVICE AND WORK MACHINE EQUIPPED WITH SAME

Title:

HYDRAULIC CONTROL DEVICE AND WORK MACHINE EQUIPPED WITH SAME

Document Type and Number:

WIPO Patent Application WO/2013/057919

Kind Code:

A1

Abstract:

Provided is a hydraulic control device for which it is possible to reduce power loss and to suppress cavitation of a regenerative motor for regenerating energy possessed by a hydraulic actuator; also provided is a work machine equipped with this hydraulic control device. This hydraulic control device is equipped with: a recovery oil route (R7) for recovering, in a tank (T), the operating oil elicited from hydraulic actuators (11, 12) and hydraulic pumps (16, 17); a regenerative motor (18) which rotates the output shaft (7a) of an engine (7) in response to the supply of the operating oil, and which is rotationally driven by the rotation of the output shaft (7a) of the engine (7); a regeneration oil route (R8) for guiding the oil returned from a boom cylinder (12) to the regenerative motor (18) without passing through the recovery oil route (R7); a connecting oil route (R9) connecting the recovery oil route (R7) and the regeneration oil route (R8); and a regeneration-side check valve (21) which is provided in the connecting oil route (R9), and which permits the flow of operating oil from the recovery oil route (R7) toward the regenerative motor (18) and restricts the flow of operating oil from the regenerative motor (18) toward the recovery oil route (R7).

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Inventors:

NANJO TAKAO
SENOO SABURO
GOTO NAOKI

Application Number:

PCT/JP2012/006597

Publication Date:

April 25, 2013

Filing Date:

October 15, 2012

Export Citation:

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Assignee:

KOBE STEEL LTD (JP)
KOBELCO CONSTR MACH CO LTD (JP)

International Classes:

F15B21/14; E02F9/22; F15B11/02

Foreign References:

JP2009138538A	2009-06-25
JP2007263160A	2007-10-11
JP2000136806A	2000-05-16
JP2006064071A	2006-03-09
JP2003120616A	2003-04-23

Other References: