专利名称：Hydraulic circuit for heavy equipment发明人：Cheong, Hae Kyun申请号：EP08017769.4申请日：20081010公开号：EP2050970B1公开日：20130703
摘要：A hydraulic circuit includes first to third hydraulic pumps connected to an engine(1); a first control valve (5) installed in a flow path of the first hydraulic pump; a secondcontrol valve (5a) installed in a flow path of the second hydraulic pump; a hydraulic motor(9) connected to the third hydraulic pump (4); a cooling fan (10), connected to thehydraulic motor (9), for discharging cooling wind to an oil cooler (11); a temperaturesensor (13) for detecting a temperature of the hydraulic fluid in the hydraulic tank (T); anelectric relief valve (12), installed in a drain flow path of the third hydraulic pump (4), forvariably controlling a rotation velocity of the cooling fan (10); a controller (14) forcontrolling the hydraulic pressure that drives the hydraulic motor (9); and a pilotpressure generator (6), installed in a pilot flow path (18) branched and connected to aflow path (17) of the third hydraulic pump (4), for supplying a pilot signal pressure to thefirst (5) and second (5a) control valves when shifting.
申请人：VOLVO CONSTR EQUIP HOLDING SE
地址：SE
国籍：SE
代理机构：Schmidt, Sven Hendrik
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