Hydraulic rotary machine and valve plate thereof

A hydraulic rotary machine comprising:

• a cylinder block to which a shaft is connected so as to be rotated with the shaft;
• a plurality of cylinders formed on the cylinder block, the plurality of cylinders being disposed at a predetermined interval in a circumferential direction of the shaft;
• a piston slidably inserted into the cylinder, the piston defining a volume chamber inside the cylinder;
• a shoe rotatably connected to a tip end of the piston;
• a swash plate with which the shoe is in sliding contact;
• a case accommodating the cylinder block;
• and
• a valve plate formed by a core member and a resin layer coating the core member, the valve plate being provided with a supply port through which an operating liquid supplied to the volume chamber passes and a discharge port through which an operating liquid discharged from the volume chamber passes, the valve plate being interposed between the cylinder block and the case, wherein
• the valve plate has
• a sliding contact portion formed by the resin layer, the cylinder block being in sliding contact with the sliding contact portion;
• and
• a non-contact portion separated away from the cylinder block, and
• at least a part of the non-contact portion is an exposed portion where the core member is exposed.