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Patent Searching and Data


Title:
HYDRAULIC PUMP CONTROL SYSTEM FOR CONSTRUCTION MACHINERY
Document Type and Number:
WIPO Patent Application WO/2012/074145
Kind Code:
A1
Abstract:
Disclosed is a hydraulic pump control system for minimising flow loss by optimally limiting the discharge flow volume of the hydraulic pump when an upper swivel body is made to swivel abruptly. The hydraulic pump control system according to the present invention comprises: a swivel motor which is connected to a hydraulic pump; a control spool for the swivel motor, which controls the hydraulic fluid supplied to the swivel motor during switch back by means of a control signal for a remote control valve; an orifice which is provided on the furthest downstream side of a centre bypass pathway; a regulator which controls the angle of inclination of the swash plate of the hydraulic pump; a swivel operation signal detection means which detects a swivel operation signal output from the remote control valve; an electronic proportional pressure reducing valve which outputs a secondary pressure proportional to the detection signal of the swivel operation signal detection means; and a shuttle valve of which the input sides are respectively coupled to the orifice and the electronic proportional pressure reducing valve, and the output side is coupled to the regulator.

Inventors:
KIM, Mi-Ok (201 Volvo Dormitory, 33-1 Yanggok-dong, Seongsan-gu, Changwon-si, Gyeongsangnam-do 642-360, 642-360, KR)
김미옥 (경상남도 창원시 성산구 양곡동 33-1번지 볼보기숙사 201호, 642-360 Gyeongsangnam-do, 642-360, KR)
Application Number:
KR2010/008501
Publication Date:
June 07, 2012
Filing Date:
November 30, 2010
Export Citation:
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Assignee:
VOLVO CONSTRUCTION EQUIPMENT AB (SE Eskilstuna, S-631 85, SE)
볼보 컨스트럭션 이큅먼트 에이비 (스웨덴 에스킬스투나 에스이, Eskilstuna, S-631 85, SE)
KIM, Mi-Ok (201 Volvo Dormitory, 33-1 Yanggok-dong, Seongsan-gu, Changwon-si, Gyeongsangnam-do 642-360, 642-360, KR)
International Classes:
F15B9/08; E02F9/22; F15B13/02
Foreign References:
JP2006290561A2006-10-26
KR20050119762A2005-12-22
KR20030058378A2003-07-07
KR20050049767A2005-05-27
JPH1077661A1998-03-24
Other References:
None
Attorney, Agent or Firm:
YOON, Eui-Seoup (17F, Unik Bldg. 706-13,Yeoksam-dong, Gangnam-gu, Seoul 135-080, 135-080, KR)
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Claims: