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    • 9. 发明专利
    • Work machine
    • 工作机器
    • JP2014001563A
    • 2014-01-09
    • JP2012137814
    • 2012-06-19
    • Kubota Corp株式会社クボタ
    • HORII KEIJI
    • E02F9/22F15B11/00F15B11/05
    • F15B13/026E02F3/964E02F9/2225E02F9/2239E02F9/2282E02F9/2285E02F9/2292E02F9/2296F15B7/003F15B11/163F15B2211/20546F15B2211/253F15B2211/30555F15B2211/6051F15B2211/651F15B2211/652F15B2211/7135F15B2211/8613
    • PROBLEM TO BE SOLVED: To provide a work machine which includes a load sensing system including a variable displacement hydraulic pump for supplying pressure oil to a plurality of hydraulic actuators, and a PLS transmission line for transmitting the highest one of load pressures of the hydraulic actuators, for controlling the discharge pressure of the hydraulic pump to keep a pressure obtained by subtracting the highest one of the load pressures of the hydraulic actuators from the discharge pressure of the hydraulic pump, constant, and which can develop quick responsiveness at starting the hydraulic actuators and enhance body stability during the operation thereof after started.SOLUTION: In the work machine, a first load pressure distribution passage 77 and a second load pressure distribution passage 78 are provided which introduces load pressures of hydraulic actuators C2-C5 and outputting them to a PLS transmission line 44 at starting the hydraulic actuators C2-C5, and which is a flow path for introducing the load pressures of the hydraulic actuators C2-C5 and outputting them to the PLS transmission line 44 during the operation of the hydraulic actuators C2-C5 after started and has a less pressure oil distribution amount than the first load pressure distribution passage 77, respectively.
    • 要解决的问题:提供一种作业机械,其包括负载感测系统,该负载感测系统包括用于向多个液压致动器供应压力油的可变排量液压泵,以及用于传递液压致动器的最高负载压力的PLS传输线 ,用于控制液压泵的排出压力以保持通过从液压泵的排出压力中减去液压致动器的最高负载压力而获得的压力恒定,并且其可以在启动液压致动器时产生快速响应 并且在启动后的操作期间提高机体的稳定性。解决方案:在工作机中,设置有第一负载压力分配通道77和第二负载压力分配通道78,其引入液压致动器C2-C5的负载压力并将其输出到 PLS传输线44启动液压致动器C2-C5,其为流动 在液压致动器C2-C5起动后的操作期间引入液压致动器C2-C5的负载压力并将其输出到PLS传输线44的路径,并且具有比第一负载压力分配通道77更少的压力油分配量 , 分别。
    • 10. 发明专利
    • Hydraulic driving device of construction machine
    • 建筑机械液压驱动装置
    • JP2011247301A
    • 2011-12-08
    • JP2010118594
    • 2010-05-24
    • Hitachi Constr Mach Co Ltd日立建機株式会社
    • MORI KAZUSHIGETSURIGA YASUTAKATAKAHASHI KIWAMUTAKEBAYASHI KEIFUMI
    • F15B11/00E02F9/22F15B11/05F15B11/08
    • E02F9/2232E02F9/2285E02F9/2296F15B11/163F15B2211/253F15B2211/30535F15B2211/6355F15B2211/71F15B2211/7135
    • PROBLEM TO BE SOLVED: To provide the hydraulic driving device of a construction machine, in which in the case of an actuator operation other than a traveling operation, the required maximum flow rate is supplied, as in the case of the prior art, resulting in the required actuator speed being able to be obtained, and flow rates corresponding to the opening area ratios of flow rate control valves can be distributed to actuators under different load pressures during a combined operation, and thus energy loss is reduced in a traveling operation and energy efficiency is improved.SOLUTION: A travel detection device is constituted, which detects, by means of shuttle valves 37a, 37b, 37c, whether a construction machine is in a travel operation mode or not. A setting change device is constituted, which sets a target differential pressure for load sensing control to an absolute pressure Pa when the machine is not in a travel operation mode, and sets the target differential pressure for load sensing control to an absolute pressure Pa', changed from the absolute pressure Pa, when the machine is in a travel operation mode, by means of a selector valve 39, a pressure reducing valve 42, a pressure sensing section 35d of an LS control valve 35b, and an engine rotational speed detection valve device 30 including a differential pressure reducing valve 30b.
    • 要解决的问题:提供一种施工机械的液压驱动装置,其中在除了行驶操作之外的致动器操作的情况下,提供所需的最大流量,如现有技术的情况 ,从而能够获得所需的致动器速度,并且在组合操作期间,能够将与流量控制阀的开口面积比相对应的流量分配到不同负载压力下的致动器,因此在行驶中能量损失减少 运行和能源效率得到提高。 解决方案:构成行程检测装置,其通过梭阀37a,37b,37c检测建筑机械是否处于行驶操作模式。 设置设定更换装置,其在机器不处于行驶模式时将负载感测控制的目标压差设定为绝对压力Pa,将负载感测控制的目标压差设定为绝对压力Pa', 通过选择阀39,减压阀42,LS控制阀35b的压力检测部35d以及发动机转速检测阀,在机器处于行驶运转模式时,从绝对压力Pa变化 装置30包括差压减压阀30b。 版权所有(C)2012,JPO&INPIT