A hydraulic system (2) for a construction machine according to one embodiment is provided with: an electric motor (21) to which power is supplied from a battery (13); a hydraulic pump (33) driven by the electric motor (21); and a circulation pump (71) that circulates cooling water through a circulation path (7) that passes through the battery (13) and the radiator (76). The hydraulic system (2) further comprises: a heat exchanger (24) connected in parallel with the radiator (76) to the circulation path (7); a first switching valve (52) that switches whether or not to supply the hydraulic oil discharged from the hydraulic pump (33) to the heat exchanger (24); and a second switching valve (74) that switches whether to supply the cooling water passing through the battery (13) to the radiator (76) or to the heat exchanger (24).
一实施方式的工程机械的液压系统(2),包括:被从电池(13)供给电力的电动马达(21);通过电动马达(21)驱动的液压泵(33);和使冷却水在经由电池(13)以及散热器(76)的循环路(7)中循环的循环泵(71)。此外,液压系统(2)包括:与散热器(76)并联地连接于循环路(7)的热交换器(24);切换是否将从液压泵(33)吐出的工作油向热交换器(24)供给的第一切换阀(52);和切换是将通过电池(13)的冷却水向散热器(76)供给还是向热交换器(24)供给的第二切换阀(74)。
Hydraulic system for construction machine
工程机械的液压系统
2025-05-09
Patent
Electronic Resource
Chinese