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51. 发明授权

US4528892A Hydraulic circuit system for construction machine 失效
标题翻译：工程机械液压回路系统
公开(公告)号：US4528892A
公开(公告)日：1985-07-16
申请号：US469403
申请日：1983-02-24
申请人： Nobuya Okabe , Hiroshi Mizushima
发明人： Nobuya Okabe , Hiroshi Mizushima
IPC分类号： E02F3/42 , E02F9/22 , F15B11/17 , F15B11/16 , F15B13/06
CPC分类号： F15B11/17 , E02F3/42 , E02F9/2239 , E02F9/2292 , F15B2211/20538 , F15B2211/30505 , F15B2211/30595 , F15B2211/3116 , F15B2211/36 , F15B2211/40507 , F15B2211/455 , F15B2211/6355 , F15B2211/7142 , F15B2211/781
摘要： A hydraulic circuit system of a construction machine having first and second hydraulic circuit, and a bypass circuit for connecting the first and second circuits together. The first circuit includes a first hydraulic pump and a first valve group having a plurality of directional control valves for controlling a flow of hydraulic fluid from the first pump, and the second circuit includes a second hydraulic pump and a second valve group having a plurality of directional control valves for controlling a flow of hydraulic fluid from the second pump. A plurality of actuators are driven by the hydraulic fluid supplied from the first and second pumps through the valves. The bypass circuit includes a bypass line for connecting the first travel valve in series with the second travel valve in a position downstream thereof through the selecting valve. The selecting valve has first and second positions and is normally in the first position to communicate the second travel valve with the other valves of the second group to supply the hydraulic fluid from the second travel valve to the other valves. When the first travel valve and at least one of the other valves of the second group are simultaneously actuated, the selecting valve is switched to the second position to bring the second travel valve into communication with the first travel valve through the bypass line thereby to supply the hydraulic fluid from the second travel valve to the first travel valve.
摘要翻译：具有第一和第二液压回路的施工机械的液压回路系统，以及将第一和第二回路连接在一起的旁通回路。第一回路包括第一液压泵和第一阀组，其具有用于控制来自第一泵的液压流体流动的多个方向控制阀，并且第二回路包括第二液压泵和具有多个方向控制阀，用于控制来自第二泵的液压流体的流动。多个致动器由通过阀从第一和第二泵供给的液压流体驱动。旁路回路包括用于通过选择阀在其下游位置将第一行程阀与第二行程阀串联连接的旁通管路。选择阀具有第一和第二位置，并且通常处于第一位置，以将第二行程阀与第二组的其它阀连通，以将液压流体从第二行程阀提供给另一个阀。当第一行程阀和第二组的其他阀中的至少一个同时致动时，选择阀被切换到第二位置，以使第二行程阀通过旁通管与第一行程阀连通，由此供给液压流体从第二行程阀到第一行程阀。

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