| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To stabilize the pressure accumulation of an accumulator irrespective of the magnitude of the load and the operational speed even when any excessive oil is hardly generated by employing a pump rotation speed control system. <P>SOLUTION: A hydraulic pressure control device 2 includes an accumulator 70 which is connected to a main oil passage 301b, a pressure accumulationn oil passage 701 which is branched from the main oil passage 301b toward the accumulator 70, and a priority valve 36 which comprises an input port 361, a priority port 362, and a bypass port 363, the input port 361 and priority port 362 being disposed on the pressure accumulation oil passage 701, and the bypass port 363 being connected to a main oil passage 301c. The priority valve is configured in such a way that when pressure is to be accumulated in the accumulator 70, that portion of pressure oil flowing into the input port 361 which corresponds to a predetermined flow rate for accumulating pressure in the accumulator 70, is made to flow out of the priority port 362, and that the pressure oil which corresponds to an excess flow rate is made to flow out of the bypass port 363, the excess flow rate being obtained in such a way that the flow rate for pressure accumulation is subtracted from the flow rate of the pressure oil that is made to flow in. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
