Rotary swash plate hydraulic pump

A rotary swash plate hydraulic pump comprising:

• a casing;
• a cylinder block disposed in the casing so as to prevent relative rotation of the cylinder block and including a plurality of cylinder bores that are open on one end surface of the cylinder block;
• a rotary swash plate rotatably housed in the casing so as to face the one end surface of the cylinder block;
• a plurality of pistons each of which is inserted into a corresponding one of the plurality of cylinder bores and reciprocates within the corresponding one of the plurality of cylinder bores by rotation of the rotary swash plate;
• a shaft portion that is inserted through the cylinder block and moves in conjunction with the rotary swash plate;
• and
• a swash plate portion provided on the shaft portion so as to be movable back and forth in an axial direction and prevent relative rotation of the swash plate portion, wherein
• the shaft portion is pivotally supported at positions spaced apart in the axial direction in the cylinder block, and
• at least one of the plurality of pistons has an effective stroke length variable according to movement of the swash plate portion.