| 摘要 |
PURPOSE:To horizontally control a bucket when lowering a boom by feeding part of the return oil from a boom cylinder to a bucket cylinder via a divider valve and synchronizing it with the bucket cylinder. CONSTITUTION:A boom operating lever 16 is operated to switch a boom control valve 15 to the descent position C, and the pressure oil from a hydraulic pump 43 is fed to a boom cylinder 9 to perform the descent action of a boom 5. The return oil from the cylinder 9 flows into a divider valve 21, and a pressure difference is generated between the primary side and the secondary side of a throttle 23. The valve 21 is switched to the descent branch position I by the pressure difference, and part of the return oil is fed to a bucket cylinder 11 via pipelines 63 and 59 for the ascent action of a bucket 7. The descent action of the bucket 7 is performed synchronously with the ascent action of the boom 5 by nearly the same operation. |
