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31. 发明授权

US5081838A Hydraulic circuit with variable relief valves 失效
标题翻译：带可变溢流阀的液压回路
公开(公告)号：US5081838A
公开(公告)日：1992-01-21
申请号：US329823
申请日：1989-03-28
申请人： Satoshi Miyaoka , Masaaki Tachinoh
发明人： Satoshi Miyaoka , Masaaki Tachinoh
IPC分类号： E02F9/22
CPC分类号： E02F9/2282 , E02F9/2232 , E02F9/2285 , E02F9/2292 , E02F9/2296
摘要： A hydraulic circuit for a hydraulic shovel includes a variable displacement hydraulic pump; selector valves communicated with the variable displacement hydraulic pump; actuators communicated with the selector valves; variable relief valves provided in a discharge oil passage of the variable displacement hydraulic pump and also provided in input oil passages of some of the actuators; a pilot hydraulic pump communicated with the variable relief valves through pilot oil passages; a solenoid valve provided in the pilot oil passage for changing set pressures of the variable relief valves; a regulator for controlling a discharge quantity of the variable displacement hydraulic pump; and a pilot oil passage for communicating the solenoid valve with the regulator.
摘要翻译：一种用于液压挖掘机的液压回路包括可变排量液压泵; 选择阀与变量液压泵连通; 执行器与选择阀连通; 设置在可变排量液压泵的排放油通道中并且还设置在一些致动器的输入油通道中的可变溢流阀; 一个先导液压泵通过先导油通道与可变溢流阀相通; 设置在先导油路中的电磁阀，用于改变可变溢流阀的设定压力; 用于控制可变排量液压泵的排出量的调节器; 以及用于使电磁阀与调节器连通的先导油路。

32. 发明授权

US5005466A Cavitation-preventing pilot valve control system for power shovel hydraulic circuit 失效
标题翻译：用于铲铲液压回路的气蚀防止导阀控制系统
公开(公告)号：US5005466A
公开(公告)日：1991-04-09
申请号：US326017
申请日：1989-03-20
申请人： Satoshi Miyaoka
发明人： Satoshi Miyaoka
IPC分类号： E02F3/32 , E02F3/43 , E02F9/22 , F15B11/08
CPC分类号： F15B11/08 , E02F9/2203 , E02F9/226 , F15B2211/30525 , F15B2211/329 , F15B2211/6313 , F15B2211/633 , F15B2211/635 , F15B2211/6355 , F15B2211/665 , F15B2211/67 , F15B2211/8609
摘要： A hydraulic circuit suitable for use in a hydraulic operating circuit of a power shovel includes a hydraulic cylinder for driving a working component and a hydraulic change-over valve for selectively supplying the cylinder with a discharge oil pressure of a hydraulic pump driven from an engine. The hydraulic circuit prevents cavitation in an oil chamber of the cylinder and includes a pair of first signal receiving portions provided in the hydraulic change-over valve for moving the spool thereof in the forward and reverse directions away from a neutral position, respectively, and a second signal receiving portion for pulling back the spool toward said neutral position; a pressure detector produces a signal commensurate with the pressure in an oil chamber of the cylinder opposing an oil chamber where vacuum pressure is developed by the weight of the working component and a signalling device produces a signal indicating the extent of pulling back the spool toward the neutral position on receipt of the results of detection by the pressure detector, thereby supplying the signal to the second signal receiving portion of the hydraulic change-over valve.

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