Hydraulic pump motor

A hydraulic pump motor, comprising:

• a cylinder block provided with a plurality of cylinder bores around a rotation axis;
• and
• a port block on which an end surface of the cylinder block is rotatably and slidably in contact with the cylinder block via a valve plate,
• the valve plate being provided with a high pressure port on one side of a virtual plane including the rotation axis and provided with a low pressure port on another side of the virtual plane on a circumference centered on a rotation axis of the cylinder block,
• the port block being provided with a discharge oil passage that communicates with the high pressure port and a suction oil passage that communicates with the low pressure port, and
• a piston disposed in each cylinder bore reciprocating with rotation of the cylinder block, oil flowing through the discharge oil passage and the suction oil passage,
• wherein the valve plate is provided with a reproduction port at a bottom dead center side position that communicates with one of the plurality of cylinder bores between the low pressure port and the high pressure port,
• the port block is internally provided with a reproduction oil passage that communicates directly between the reproduction port and the discharge oil passage, and
• the reproduction oil passage passes through a first region on a side of the high pressure port of the virtual plane and passes through a second region on a side of the low pressure port of the virtual plane in the port block from the discharge oil passage to the reproduction port.