| 摘要 |
<p>A swash plate type hydraulic pump or motor comprises first and second swash plates (30) and (40) which move reciprocally while opposing first and second pistons (8) and (9), respectively, so as to expand and contract a volume chamber (10) according to rotation of a cylinder block (4), a pair of drive pistons (33) and (34) and a pair of drive pistons (42) and (44) which push on the first and second swash plates (30) and (40) from behind, causing the first and second swash plates (30) and (40) to tilt, respectively, and a tilt angle control valve (80) that controls the tilt angles of the first and second swash plates (30) and (40) by selectively increasing drive pressures that are guided to the drive pistons (33), (34), (43), and (44). Further, a port plate (60) is provided in a sliding portion between the first swash plate (30) and the first piston (8). The port plate (60) rotates integrally with the cylinder block (4) and guides high pressure side hydraulic fluid and low pressure side hydraulic fluid, which flow through the pair of supply and discharge ports (37) provided in a sliding surface of the first swash plate (30), to the volume chamber (10) via an inner portion of each first piston. <IMAGE></p> |
