| 摘要 |
<p>Disclosed is a hydraulic pump/motor provided with two pressure accumulation oil passages (20, 21) for accumulating pressure, which respectively communicate with a pair of ports (20a, 20b) and a pair of ports (21a, 21b), said ports (20a, 20b) and said ports (21a, 21b) being respectively provided on a valve plate on the top dead point side and the bottom dead point side, and on the outside of the slide and rotation trajectory area of cylinder bores (9-1 to 9-7). A cylinder block has two communication holes (9-1a, 9-1b) for each cylinder bore, each communication hole communicating with each cylinder bore, and having an opening that slides on each port in conjunction with the rotation of the cylinder block, to communicate with each port. The ports of each pressure accumulation oil passage (20, 21) exclusively communicate with the communication holes, so that a pressure accumulation operation for accumulating the pressure of one cylinder bore in each pressure accumulation oil passage via the communication holes in two steps, and an accumulated pressure collection operation for collecting in two steps the pressure accumulated in each pressure accumulation oil passage, within the one cylinder bore, are performed. Thus, a hydraulic pump/motor which can suppress the pulsation and a method for suppressing the pulsation of a hydraulic pump/motor can be realized by a simple structure.</p> |
