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    • 6. 发明公开
    • Hydraulic driving system of construction machinery
    • 工程机械液压传动系统
    • EP2458098A2
    • 2012-05-30
    • EP12155586.6
    • 2003-08-29
    • Hitachi Construction Machinery Co., Ltd.
    • Udagawa, TsutomuTakiguchi, KazuoOchiai, MasamiYagyuu, TakashiSugiyama, YukihikoAihara, Mitsuo
    • E02F9/22
    • E02F9/2228E02F9/2242E02F9/2292F15B11/165F15B11/167F15B11/17F15B21/087F15B2211/20576F15B2211/30505F15B2211/3056F15B2211/3116F15B2211/31576F15B2211/327F15B2211/40515F15B2211/40546F15B2211/413F15B2211/4159F15B2211/426F15B2211/45F15B2211/476F15B2211/50518F15B2211/665F15B2211/71
    • The invention relates to a construction machine comprising a travel body (79), a swing body (13) swingably mounted onto said travel body (79), a boom (75), an arm (76), and a bucket (77) and a hydraulic drive system.
      The hydraulic drive system comprises a plurality of directional flow control valves (10a-f; 10a-h) including a boom, arm and bucket directional flow control valves, a boom inflow control valve (201), an arm inflow control valve (202), and a bucket inflow control valve (203).
      It is proposed that said boom inflow control valve (201), said arm inflow control valve (202) and said bucket inflow control valve (203) are provided only for the rod pushing-side chamber (5aA, 5bA) of a boom hydraulic cylinder (5a, 5b), the rod pushing-side chamber (6A) of an arm hydraulic cylinder (6) and the rod pushing-side chamber (7A) of a bucket hydraulic cylinder (7).
      Furhter, said plurality of directional flow control valves (10a-f; 10a-h) including the boom, arm and bucket directional flow control valves are disposed in said swing body,said boom inflow control valves (201), said arm inflow control valves (20) and said bucket inflow control valve (203) are all disposed together in one control valve unit (190), and
      said one control valve unit (190) is disposed on the upper surface of said boom (75).
    • 本发明涉及包括行驶体(79),可摆动地安装在所述行驶体(79)上的摆动体(13),动臂(75),臂(76)和铲斗(77)的建筑机械以及 一个液压驱动系统。 液压驱动系统包括包括动臂,斗臂和铲斗方向流量控制阀,动臂流入控制阀(201),斗杆流入控制阀(202)的多个方向流量控制阀(10a-f; 10a-h) ,以及铲斗流入控制阀(203)。 建议所述悬臂流入控制阀(201),所述悬臂流入控制阀(202)和所述铲斗流入控制阀(203)仅设置在悬臂液压缸的杆推动侧室(5aA,5bA) (5a,5b),斗杆液压缸(6)的杆推动侧室(6A)和铲斗液压缸(7)的杆推动侧室(7A)之间。 所述多个方向流量控制阀(10a-f; 10a-h)包括所述动臂,斗杆和铲斗方向流量控制阀,所述动臂流入控制阀(201),所述动臂流入控制阀 (20)和所述铲斗流入控制阀(203)一起设置在一个控制阀单元(190)中,并且所述一个控制阀单元(190)设置在所述悬臂(75)的上表面上。