公开(公告)号：US20040231505A1

公开(公告)日：2004-11-25

申请号：US10847359

申请日：2004-05-18

申请人： NABCO Limited

发明人： Kensuke Ioku ,  Jun Nakano

IPC分类号： F15B011/08

CPC分类号： E02F9/2267 ,  E02F3/433 ,  E02F9/2271 ,  F15B11/20

摘要： In a multiple-switching valve having a bucket-leveling function, there are provided a diverged passage, which is diverged from a merged passage and connects with an unloading passage or a tank passage, and a switching valve to disconnect and connect the diverged passage. The switching valve allows a pressured oil drained from a rod-side chamber of a boom cylinder via a directional switching valve for boom to be supplied to the merged passage flow in the diverged passage, thereby preventing the pressure oil from being supplied to a head-side chamber of the bucket cylinder. Accordingly, the bucket-leveling function can be cancelled properly, thereby improving the operation of the multiple-directional switching valve.

摘要翻译： 在具有铲斗平整功能的多重切换阀中，设置有从合流通道分离并与卸载通道或罐通道连接的分叉通道，以及切换阀，以断开和连接分流通道。 切换阀允许通过用于悬臂的方向切换阀从动臂缸的杆侧室排出的加压油被供给到分流通路中的合流通道，从而防止压力油被供给到头部 - 铲斗缸的侧室。 因此，可以正确地取消铲斗调平功能，从而改善多方向切换阀的操作。

公开(公告)号：US20040250677A1

公开(公告)日：2004-12-16

申请号：US10847358

申请日：2004-05-18

申请人： NABCO Limited

发明人： Kensuke Ioku ,  Jun Nakano

IPC分类号： F01B001/00

CPC分类号： E02F9/2267 ,  E02F3/433 ,  E02F9/2225 ,  E02F9/2271 ,  F15B11/20

摘要： There is provided a flow divider system in a hydraulic circuit for a work machine including a boom cylinder and a bucket cylinder. The flow divider system divides a pressured oil drained from a one-boom cylinder into an other-bucket cylinder and a tank via a first orifice, a second orifice and a flow dividing valve, maintaining a specified pressure difference between pressures downstream the first and second orifices. The first and second orifice are configured of a variable orifice respectively, and in the event that the oil flow from the one-boom chamber decreases, respective opening degrees of the first and second orifices are controlled so as to be reduced. Accordingly, changing of a divisional ratio of oil flow can be suppressed properly regardless of a small oil flow drained from the boom cylinder.

摘要翻译： 在包括动臂缸和铲斗缸的作业机械的液压回路中设置有分流器系统。 分流器系统通过第一孔，第二孔和分流阀将从单臂液压缸排出的加压油分成另一桶缸和罐，在第一和第二下游的压力之间保持规定的压力差 孔。 第一和第二孔口分别由可变孔口构成，并且在来自单臂室的油流量减小的情况下，第一和第二孔口的相应开度被控制以减小。 因此，能够适当地抑制油流量的分割比的变化，而不管从动臂油缸排出的小的油流。