CONTROL DEVICE FOR A HYDRAULIC PUMP OF CONSTRUCTION MACHINERY

WIPO Patent Application WO/2012/002589

A1

Disclosed is a negative-control-type control device for a hydraulic pump installed on an excavator or other construction machinery. A control device for a hydraulic pump of construction machinery according to the present invention comprises: an accumulator for storing control signal pressure; a solenoid valve for supplying either signal pressure or negative pressure from the accumulator during switching according to an applied control signal; and control lever closing means for turning a control signal applied to the solenoid valve on or off according to the control of an operator, wherein during the startup of the engine, negative pressure arising from working fluid supplied from the accumulator due to switching of the solenoid valve is compensated for, and the swivel angle of a sieve plate is maintained in a minimum flow position.

JP2003206908	AIR SERVO VALVE
JP2005214412	PULSE DURATION MODULATION SOLENOID
JP11325004	SOLENOID-OPERATED DOUBLE-SPOOL CONTROL VALVE

KIM, Dong-Soo (1 Posco The Sharp Apt, Gyeonghwa-dongJinhae-si, Gyeongsangnam-do 645-752, 645-752, KR)
김동수 (경상남도 진해시 경화동 포스코더샵아파트, 645-752 Gyeongsangnam-do, 645-752, KR)

KR2010/004250

January 05, 2012

June 30, 2010

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VOLVO CONSTRUCTION EQUIPMENT AB (SE Eskilstuna, SE 631 85, SE)
볼보 컨스트럭션 이큅먼트 에이비 (스웨덴 에스킬스투나, SE Eskilstuna, SE 631 85, SE)
KIM, Dong-Soo (1 Posco The Sharp Apt, Gyeonghwa-dongJinhae-si, Gyeongsangnam-do 645-752, 645-752, KR)

F15B13/044; E02F9/22; F04B27/08; F16K31/06

YOON, Eui-Seoup (17th Floor, UNIK Bldg. 706-13,Yeoksam-dong, Gangnam-gu, Seoul 135-080, 135-080, KR)

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