Hydraulic circuit for heavy equipment

专利名称：Hydraulic circuit for heavy equipment发明人：Hae Kyun Cheong申请号：US12246515申请日：20081007公开号：US08024926B2公开日：20110927

专利附图：

摘要：A hydraulic circuit for heavy equipment is disclosed, which utilizes a hydraulicfluid supplied from a hydraulic pump for driving a cooling fan, as a pilot signal pressure,without installing a separate constant displacement pilot pump for supplying the pilotsignal pressure to a control valve for controlling the hydraulic fluid to be supplied to a

working device such as a boom. The hydraulic circuit includes first to third hydraulicpumps connected to an engine; a first control valve installed in a flow path of the firsthydraulic pump; a second control valve installed in a flow path of the second hydraulicpump; a hydraulic motor connected to the third hydraulic pump; a cooling fan, connectedto the hydraulic motor, for discharging cooling wind to an oil cooler; a temperaturesensor for detecting a temperature of the hydraulic fluid in the hydraulic tank; an electricrelief valve, installed in a drain flow path of the third hydraulic pump, for variablycontrolling a rotation velocity of the cooling fan; a controller for controlling thehydraulic pressure that drives the hydraulic motor; and a pilot pressure generator,installed in a pilot flow path branched and connected to a flow path of the third hydraulicpump, for supplying a pilot signal pressure to the first and second control valves whenshifting.

申请人：Hae Kyun Cheong

地址：Pusan KR

国籍：KR

代理机构：Ladas & Parry LLP

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