| 摘要 |
<p>PURPOSE:To improve spool strength and to decrease passage resistance, by providing a predetermined communication function and communication condition adjusting function in a hydraulic cylinder actuating variably regenerating circuit valve, independently of a hydraulic selector valve so as to simplify constitution of the variably regenerating circuit valve. CONSTITUTION:The control level of a pilot valve 29 is pulled in a direction J in the drawing, and if a signal pressure is generated in a pilot oil path 30, a hydraulic selector valve 3 is switched to a position G, and pressure oil from a pump 1 passes through an oil path 24 from a port A being allowed to flow into the head side oil chamber C of a hydraulic cylinder 2. And as the hydraulic cylinder 2 extends, return oil from a rod side oil chamber D is allowed to flow into the selector valve 3 from an oil path 25 and a port B. Here the return oil generates a pressure higher than the pressure in the head side oil chamber C, accordingly a regenerating circuit, is formed. So that pressure oil in a high pressure passage 15' can detach a piston 11 from a check part 10 via a notched hole 18 and an oil chamber 8, passing through a notched hole 12 and joining a bridge circuit 17.</p> |
