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HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE, AND HYDRAULIC CIRCUIT
Provided is a hydraulic circuit for a construction machine, in which an actuator is driven by merging pressure oil from a fixed-capacity pump with a central bypass oil passage extending from a variable-capacity pump to an oil tank, and the flow rate flowing from the fixed-capacity pump to the central bypass oil passage can be controlled in accordance with the flow rate requested by the actuator. A distribution direction switching valve (64) has a first oil passage (64a) extending from the fixed capacity pump (62) to the tank (T), and a second oil passage (64b) extending from the fixed capacity pump (62) to the first center bypass oil passage (61c). The direction switching valve (64) for distribution is provided with a first signal receiving part (641) which enables the valve element to slide in the direction of forming the first oil path (64a), and a second signal receiving part (642) which enables the valve element to slide in the direction of forming the second oil path (64b). According to the magnitude difference of signals received by the first signal receiving part (641) and the second signal receiving part (642), the distribution rate of the pressure oil flowing into the first oil passage (64a) and the second oil passage (64b) is determined, and the first signal receiving part (641) receives a signal based on a negative control signal.
本发明提供一种液压回路，建筑机械的液压回路使来自固定容量型泵的压力油与从可变容量型泵至油箱的中央旁通油路汇合而使致动器驱动，能够根据致动器的要求流量来控制从固定容量型泵向中央旁通油路流动的流量。分配用方向切换阀(64)具有：从固定容量型泵(62)至油箱(T)的第一油路(64a)、以及从固定容量型泵(62)至第一中央旁通油路(61c)的第二油路(64b)，且该分配用方向切换阀(64)具有：使阀芯在形成第一油路(64a)的方向上滑动的第一信号接收部(641)、以及使阀芯在形成第二油路(64b)的方向上滑动的第二信号接收部(642)，根据第一信号接收部(641)和第二信号接收部(642)接收到的信号的大小差异，来确定向第一油路(64a)和第二油路(64b)流动的压力油的分配率，第一信号接收部(641)接收基于负控制信号的信号。
HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE, AND HYDRAULIC CIRCUIT
Provided is a hydraulic circuit for a construction machine, in which an actuator is driven by merging pressure oil from a fixed-capacity pump with a central bypass oil passage extending from a variable-capacity pump to an oil tank, and the flow rate flowing from the fixed-capacity pump to the central bypass oil passage can be controlled in accordance with the flow rate requested by the actuator. A distribution direction switching valve (64) has a first oil passage (64a) extending from the fixed capacity pump (62) to the tank (T), and a second oil passage (64b) extending from the fixed capacity pump (62) to the first center bypass oil passage (61c). The direction switching valve (64) for distribution is provided with a first signal receiving part (641) which enables the valve element to slide in the direction of forming the first oil path (64a), and a second signal receiving part (642) which enables the valve element to slide in the direction of forming the second oil path (64b). According to the magnitude difference of signals received by the first signal receiving part (641) and the second signal receiving part (642), the distribution rate of the pressure oil flowing into the first oil passage (64a) and the second oil passage (64b) is determined, and the first signal receiving part (641) receives a signal based on a negative control signal.
本发明提供一种液压回路，建筑机械的液压回路使来自固定容量型泵的压力油与从可变容量型泵至油箱的中央旁通油路汇合而使致动器驱动，能够根据致动器的要求流量来控制从固定容量型泵向中央旁通油路流动的流量。分配用方向切换阀(64)具有：从固定容量型泵(62)至油箱(T)的第一油路(64a)、以及从固定容量型泵(62)至第一中央旁通油路(61c)的第二油路(64b)，且该分配用方向切换阀(64)具有：使阀芯在形成第一油路(64a)的方向上滑动的第一信号接收部(641)、以及使阀芯在形成第二油路(64b)的方向上滑动的第二信号接收部(642)，根据第一信号接收部(641)和第二信号接收部(642)接收到的信号的大小差异，来确定向第一油路(64a)和第二油路(64b)流动的压力油的分配率，第一信号接收部(641)接收基于负控制信号的信号。
HYDRAULIC CIRCUIT FOR CONSTRUCTION MACHINE, AND HYDRAULIC CIRCUIT
建筑机械的液压回路及液压回路
ONO JUNYA (author) / MATSUYAMA HIROSHI (author) / KAGEYAMA NAOTO (author) / IWASAKI HITOSHI (author) / TUKAHARA NANAMI (author)
2021-10-22
Patent
Electronic Resource
Chinese
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