| 摘要 |
<p>A hydraulic pump motor (100, 200, 300, 400) is provided with: a supply/discharge passage (4) through which operating fluid sucked by a hydraulic pump (10) flows and through which hydraulic fluid discharged from a hydraulic motor (20) flows; and a variable valve (7, 207, 307, 407) which is provided in the supply/discharge passage (4) and which can adjust the flow area of the supply/discharge passage (4). The variable valve (7, 207, 307, 407) sets the flow area of the supply/discharge passage (4) at the time when both the hydraulic pump (10) and the hydraulic motor (20) operate simultaneously to be less than the flow area of the supply/discharge passage (4) at the time when only one of the hydraulic pump (10) and the hydraulic motor (20) operates.</p> |
