HYDRAULIC CIRCUIT FOR CONSTRUCTION EQUIPMENT

Title:

HYDRAULIC CIRCUIT FOR CONSTRUCTION EQUIPMENT

Document Type and Number:

WIPO Patent Application WO/2016/043365

Kind Code:

A1

Abstract:

Disclosed is a hydraulic circuit for construction equipment for controlling to selectively supply a hydraulic oil from a hydraulic pump to a hydraulic cylinder for driving a boom. The hydraulic circuit for construction equipment, according to the present invention, comprises: a hydraulic cylinder driven by a hydraulic oil of a hydraulic pump; a direction control valve installed on the oil passage between the hydraulic pump and the hydraulic cylinder; an operating device installed on the oil passage between a pilot pump and the direction control valve; a center by-pass switching valve installed at the most downstream side of a center by-pass passage of the hydraulic pump; a pressure detection sensor that detects the pressure of a hydraulic oil at the large chamber side of the hydraulic cylinder; a jack-up switching valve installed on the oil passage between the operating device and the center by-pass switching valve; and a flow control valve installed in the spool of the direction control valve.

Inventors:

JOUNG HEA-GYOON (KR)

Application Number:

PCT/KR2014/008745

Publication Date:

March 24, 2016

Filing Date:

September 19, 2014

Export Citation:

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Assignee:

VOLVO CONSTR EQUIP AB (SE)
JOUNG HEA-GYOON (KR)

International Classes:

E02F9/20; E02F9/22

Foreign References:

KR20050090078A	2005-09-12
JP2006292068A	2006-10-26
KR20140081989A	2014-07-02
KR20140074306A	2014-06-17
KR101301234B1	2013-08-29

Other References: