Patent ID: 8425699

Claim:
A method for manufacturing a swash plate type piston pump motor in which: a plurality of pistons are arranged in a circumferential direction on a cylinder block configured to rotate with a rotating shaft; the pistons are guided along a swash plate to reciprocate by rotation of the rotating shaft; a convex portion of the swash plate is slidably supported by a recess of a swash plate support; and a wall formed integrally with the swash plate support is arranged on a normal to at least a part of a supporting surface of the recess, wherein: the supporting surface of the recess of the swash plate support is quenched by irradiating the supporting surface with laser light while causing the laser light to scan the supporting surface; an output of the laser light is changed in accordance with an incidence angle of the laser light with respect to the supporting surface; a material of the supporting surface is cast iron; a depth of the quenching is set in a range from 0.25 to 0.45 mm; an area of a quenched portion of the supporting surface is set to 50 to 70% of an area of the supporting surface by partially irradiating the supporting surface with the laser light; and by irradiating the supporting surface with the laser light in a stripe pattern such that quenched lines are formed to extend in a direction substantially perpendicular to a tilt direction of the swash plate, the quenched lines and non-quenched lines form projections and depressions.