| 摘要 |
PURPOSE:To aim at minimizing a swash plate tilting angle when a main selector valve is neutral and lowering a motor load in time of neutrality, by controlling a regulator with pilot pressure employed, in case of a control device provided with such a regulator that adjusts the swash plate tilting angle of a main pump. CONSTITUTION:Compressed fluid out of a main pump 2 driven by a motor 1 is led to plural main selector valves 4-7 being connected to each operating unit via a compressed fluid tube 3 and one of the main selector valves 4-7 is switched by control levers 8-11 whereby the operating units concerned are energized. In this case, a pilot pump 15 driven by the motor 1 is installed, receiving pilot pressure from the pump 15 via a feed tube 16, and thereby a tilting angle theta of a swash plate 19 of the main pump 2 is controlled via control cylinders 17 and 18 by a regulator 20. In addition, on the way to the feed tube 16, a pilot pressure selector valve 22 to be controlled via selector bracket 23 by the said levers 8-11 is installed. |
