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Patent Searching and Data


Title:
HYDRAULIC SYSTEM FOR CONSTRUCTION EQUIPMENT
Document Type and Number:
WIPO Patent Application WO/2013/085086
Kind Code:
A1
Abstract:
Disclosed is a hydraulic system for increasing the fuel efficiency of equipment by lowering the relief pressure of a relief valve so as to minimize the loss of power of an engine when in a standby mode, in which a working device or the like is not in operation. The hydraulic system according to the present invention comprises: an operation lever; a hydraulic pump and a pilot pump respectively connected to an engine; an actuator for a work device, which is connected to the hydraulic pump; a control valve which is converted by the manipulation of the operation lever so as to control hydraulic fluid supplied to the actuator for a work device; a two-stage relief valve which is mounted on a pilot signal line of the pilot pump and converted into the first relief pressure and the second relief pressure according to electric control signals from the outside; a detection means for detecting whether or not equipment is in operation; and a controller which outputs a control signal so as to convert the two-stage relief valve into the second relief pressure by the detection signal of the detection means if the equipment is in operation and to convert the two-stage relief valve into the first relief pressure by the detection signal of the detection means if the equipment is in a standby state.

Inventors:
JEE SE-RIB (KR)
PARK SUNG-BOK (KR)
PARK HYUNG-SEOK (KR)
Application Number:
KR2011/009505
Publication Date:
June 13, 2013
Filing Date:
December 09, 2011
Export Citation:
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Assignee:
VOLVO CONSTR EQUIP AB (S-631 85, SE)
JEE SE-RIB (KR)
PARK SUNG-BOK (KR)
PARK HYUNG-SEOK (KR)
International Classes:
F15B13/043; E02F9/22; F15B13/044; F15B19/00; F15B21/08
Foreign References:
KR20110100289A2011-09-09
KR20100119585A2010-11-09
JPH09178025A1997-07-11
JP2001500953A2001-01-23
Attorney, Agent or Firm:
YOON, Eui-Seoup (135-080, KR)
윤의섭 (135-080, KR)
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Claims: