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    • 21. 发明申请
    • Hydraulic Drive Device for Construction Machine
    • 施工机械液压驱动装置
    • US20110192156A1
    • 2011-08-11
    • US13009302
    • 2011-01-19
    • Kensuke SatoHiroyuki AzumaTsuyoshi NakamuraYasuo OkanoKouji IshikawaMitsuhiko Kanehama
    • Kensuke SatoHiroyuki AzumaTsuyoshi NakamuraYasuo OkanoKouji IshikawaMitsuhiko Kanehama
    • F04B49/02
    • E02F9/2246E02F9/2235
    • A hydraulic drive device for a construction machine which can reliably judge whether or not the state of the construction machine is appropriate for stopping an engine is provided. The hydraulic drive device includes: a main pump 13; a regulator 15 that controls the discharge rate of the main pump 13 by a control pressure Pc; an engine 16 that drives the main pump 13; an engine stopping unit 83 that stops the engine 16 when a predetermined state of the construction machine has continued for a predetermined period of time; and a pressure sensor 72 that detects the control pressure Pc. The engine stopping unit 83 has a control signal judging unit 81 that judges whether or not the control pressure Pc detected by the pressure sensor 72 is lower than a predetermined pressure value Pc1, as a judgment of whether or not the predetermined state of the construction machine is present. The engine stopping unit 83 stops the engine 16 when a judgment result that the control pressure Pc is lower than the predetermined pressure value Pc1 is obtained. The predetermined pressure value Pc1 is a pressure value for controlling the discharge rate of the main pump 13 to the lower limit for use in the construction machine.
    • 提供一种用于建筑机械的液压驱动装置,其可以可靠地判断施工机械的状态是否适合于停止发动机。 液压驱动装置包括:主泵13; 调节器15,其通过控制压力Pc控制主泵13的排出速度; 驱动主泵13的发动机16; 发动机停止单元83,其在建筑机械的预定状态持续预定时间段时停止发动机16; 以及检测控制压力Pc的压力传感器72。 发动机停止单元83具有控制信号判断单元81,判定由压力传感器72检测到的控制压力Pc是否低于预定压力值Pc1,作为对施工机械的预定状态的判断 存在。 当获得控制压力Pc低于预定压力值Pc1的判定结果时,发动机停止单元83停止发动机16。 预定压力值Pc1是用于将主泵13的排出速度控制在建筑机械中使用的下限的压力值。
    • 23. 发明授权
    • Steering device for construction vehicle
    • 施工车辆转向装置
    • US07913801B2
    • 2011-03-29
    • US12523937
    • 2008-01-22
    • Tsuyoshi NakamuraKentaro ItogaHiroyuki AzumaKazunori Nakamura
    • Tsuyoshi NakamuraKentaro ItogaHiroyuki AzumaKazunori Nakamura
    • B62D5/04
    • B62D1/22B62D5/09B62D12/00E02F9/2228E02F9/225E02F9/2285
    • To provide a steering system for a construction vehicle, which is suited not only for traveling on general roadways but also for work at construction sites and can perform high-reliability steering control.A steering system for a construction vehicle is provided with a directional control valve 5 for controlling a flow of pressure oil to body-articulating hydraulic cylinders 2 that perform steering and also with a steering-wheel-operated signal generation means 6 for outputting by operation of a steering wheel 7a a pilot signal to the directional control valve 5 for switching the valve 5. The steering system is also provided with a lever-operated signal generation means for producing by operation of a lever 10a a pilot signal to switch the directional control valve 5, said lever-operated signal generation means including pressure-proportional solenoid valves 12a,12b or the like, selector valves 13a,13b switchable to permit selectively outputting the pilot signal from one of the signal generation means to the directional control valve 5, and an automated switching means for switching the selector valves 13a,13b such that upon operation of the steering wheel 7a, the pilot signal from the steering-wheel-operated signal generation means 6 can be preferentially outputted to the directional control valve 5.
    • 提供一种适用于工程车辆的转向系统,不仅适用于一般道路行驶,而且适用于施工现场的工作,还可进行高可靠性的转向控制。 用于施工车辆的转向系统设置有用于控制压力油流向执行转向的身体关节液压缸2的方向控制阀5,以及用于通过操作输出的方向盘操作信号产生装置6输出 方向盘7a向方向控制阀5提供用于切换阀5的导向信号。转向系统还设置有操作杆操作信号产生装置,用于通过操作杆10a产生一个导向信号以切换方向控制阀 如图5所示,所述杠杆操作信号发生装置包括比例电磁阀12a,12b等,切换阀13a,13b可切换以允许选择性地将信号从信号发生装置中的一个输出到方向控制阀5;以及 用于切换选择阀13a,13b的自动切换装置,使得在方向盘7a操作时,来自s的导频信号 可以将方向盘操作信号发生装置6优先输出到方向控制阀5。
    • 24. 发明授权
    • Steering system for engineering vehicle
    • 工程车辆转向系统
    • US07891458B2
    • 2011-02-22
    • US12303288
    • 2007-12-07
    • Kazunori NakamuraTsuyoshi NakamuraKouji IshikawaHiroyuki AzumaKentarou Itoga
    • Kazunori NakamuraTsuyoshi NakamuraKouji IshikawaHiroyuki AzumaKentarou Itoga
    • B62D5/06
    • B62D5/075E02F9/225
    • A priority valve 7 is disposed between a hydraulic pump 2 and a steering valve 4 and is used to supply priority steering cylinders 103a and 103b with pressurized oil discharged from the hydraulic pump 2 by controlling the differential pressure across a meter-in hydraulic line of the steering valve 4 such that the differential pressure is kept at a target value. A pressure sensor 31 for detecting the load pressures of the steering cylinders 103a and 103b is provided. On the basis of the detected load pressures, the target value set for the priority valve 7 is modified by devices including a controller 32, a solenoid valve 33, a pilot hydraulic line 29, and a pressure receiving unit 24c of the priority valve 7. The above configuration enables suppression of a shock occurring at the start of turning of the steering wheel.
    • 优先阀7设置在液压泵2和转向阀4之间,并且用于通过控制液压泵2的流入液压管路中的压差来向液压泵2排出的加压油供应优先转向缸103a和103b。 转向阀4使差压保持在目标值。 设置有用于检测转向缸103a,103b的负载压力的压力传感器31。 基于检测到的负载压力,通过包括优先阀7的控制器32,电磁阀33,先导液压管路29和压力接收单元24c的装置来改变对优先阀7设定的目标值。 上述结构能够抑制在方向盘转动开始时发生的冲击。