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11. 发明专利

JP2009097722A Hydraulic circuit for construction machinery 审中-公开
标题翻译：建筑机械液压回路
公开(公告)号：JP2009097722A
公开(公告)日：2009-05-07
申请号：JP2008263528
申请日：2008-10-10
申请人： Volvo Construction Equipment Ab , ボルボコンストラクションイクイップメントアーベー
发明人： CHEONG HAE KYUN
IPC分类号： F15B11/08 , E02F9/00 , E02F9/22 , F15B21/04
CPC分类号： F15B11/17 , E02F9/2228 , E02F9/2242 , E02F9/2292 , E02F9/2296 , F15B21/042 , F15B2211/20546 , F15B2211/20576 , F15B2211/3116 , F15B2211/41509 , F15B2211/428 , F15B2211/45 , F15B2211/50509 , F15B2211/575 , F15B2211/6343 , F15B2211/6355 , F15B2211/66 , F15B2211/7142
摘要： PROBLEM TO BE SOLVED: To use working fluid from hydraulic pumps employed to drive a cooling fan for pilot signal pressure without additionally installing a fixed displacement pilot pump on control valves which control working fluid supplied to an actuator.
SOLUTION: A hydraulic circuit for a construction machinery includes the first, second and third hydraulic pumps 2, 3, 4 which are connected to an engine, the first and second control valves 5, 5a which control working fluid supplied to the actuator which drives a working device, a hydraulic motor 9, the cooling fan 10 which discharges cooling wind to an oil cooler 11 and makes working fluid returning to a hydraulic tank T cool, a temperature sensor 13 which detects working fluid temperature in the hydraulic tank T, an electrical type relief valve 12 which controls driving pressure of the hydraulic motor 9 so as to be capable of controlling revolving speed of the cooling fan 10, a controller 14 which controls the hydraulic motor 9, and a pilot pressure generator 6 which is provided in a pilot flow passage 18 branched and connected to a flow passage 17 of the third hydraulic pump 4 and supplies the pilot signal pressure to the first and second control valves 5, 5a when switched.
COPYRIGHT: (C)2009,JPO&INPIT
摘要翻译：要解决的问题：使用液压泵的工作流体驱动冷却风扇进行先导信号压力，而不需要在控制供给致动器的工作流体的控制阀上安装固定位移先导泵。解决方案：用于工程机械的液压回路包括连接到发动机的第一，第二和第三液压泵2,3,4，第一和第二控制阀5,5a，其控制供应到致动器的工作流体驱动工作装置的液压马达9，将冷却风向油冷却器11排出并使返回到液压箱T的工作流体冷却的冷却风扇10，检测液压箱T中的工作流体温度的温度传感器13 控制液压马达9的驱动压力以便能够控制冷却风扇10的转速的电动式安全阀12，控制液压马达9的控制器14以及设置有先导压力发生器6 在与第三液压泵4的流路17分支并连接的先导流路18中，在切换时将先导信号压力提供给第一和第二控制阀5,5a。版权所有（C）2009，JPO＆INPIT

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