| 摘要 |
<p>PURPOSE:To perform hydraulic drive effectively and prevent actuation of a working cylinder which may cause trouble of the working cylinder preliminarily and automatically by increasing or decreasing a speed of the working cylinder in accordance with the size of a load without using a manual changing valve or a complicated pressure control circuit. CONSTITUTION:In a speed-increasing hydraulic circuit, pressure oil from a hydraulic pump 1 is connected from a port 11 through a first pressure balance type changing valve 5, a duct 14, and a port 16 to a working cylinder piston unit 10, and a return side duct 18 of the working cylinder piston unit 10 is connected through a second pressure balance type changing valve 9, a duct 24 or duct 20 on the return side to a tank 2, first check valve 6, and a duct 14 to the port 16.</p> |
