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    • 62. 发明公开
    • 건설 기계의 유압 회로
    • 建筑设备液压回路
    • KR1020130057947A
    • 2013-06-03
    • KR1020120132930
    • 2012-11-22
    • 나부테스코 가부시키가이샤
    • 나카노준하타나카야스노리
    • F15B11/02E02F9/22
    • E02F9/22B60Y2200/41E02F9/2267E02F9/2292F15B11/04
    • PURPOSE: A hydraulic circuit of construction equipment is provided to increase a lifting speed for a boom by efficiently using first, second, third pumps supplying hydraulic oil to three system circuits when lifting the boom. CONSTITUTION: A hydraulic circuit of construction equipment comprises a first unload path(12) connected to a first pump, a first system circuit, a second unload path(13) connected to a second pump, a third unload path(29) connected to a third pump, and a third system circuit. The first system circuit is connected to the first unload path and has a direction changing valve(4x) for a boom supplying hydraulic oil to an actuator(57) for the boom. A second system circuit is connected to the second unload path and has a direction changing valve(5y) for an arm supplying the hydraulic oil to an actuator(58) for the arm. The third system circuit is connected to the third unload path and has a direction changing valve(6w) for rotation supplying the hydraulic oil to an actuator(61) for rotation. [Reference numerals] (AA) Third system circuit; (BB) Second system circuit; (CC) First system circuit
    • 目的:提供施工设备的液压回路,通过在提升吊杆时,通过有效地使用向三个系统回路供应液压油的第一,第二和第三泵提高吊臂的提升速度。 构成:施工设备的液压回路包括连接到第一泵的第一卸载路径(12),连接到第二泵的第一系统电路,第二卸载路径(13),连接到第二泵的第三卸载路径(29) 第三泵和第三系统电路。 第一系统电路连接到第一卸载路径,并且具有用于供应液压油的起重臂的方向转换阀(4x)到用于起重臂的致动器(57)。 第二系统电路连接到第二卸载路径,并且具有方向切换阀(5y),用于将工作油供给到用于臂的致动器(58)的臂。 第三系统电路连接到第三卸载路径,并且具有方向切换阀(6w),用于将液压油旋转供给到用于旋转的致动器(61)。 (附图标记)(AA)第三系统电路; (BB)第二系统电路; (CC)第一系统电路