| 摘要 |
<p>The purpose of the present invention is to reduce the pressure loss of a hydraulic pump. Ports (11, 12) are formed in a port plate (10). The port plate (10) and a piston unit rotate relative to each other about the rotation axis (S). Valve plate holes respectively connected to cylinders are formed in the valve plate of the piston unit. The valve plate holes are arranged on a circle centered on the rotation axis (S). Each of the ports (11, 12) is formed in a circular are shape centered on the rotation axis (S). The port plate (10) is provided with bridges (13) for dividing the port (11) in the circumferential direction to form port holes (11a) and with bridges (14) for dividing the port (12) in the circumferential direction to form port holes (12a). The sum of the number of the port holes (11a) and the number of the port holes (12a) is greater than the number of the valve plate holes.</p> |
