| 摘要 |
To improve productivity and increase seizing resistance and abrasion resistance of a sliding surface of a tilt adjustment cylinder. A plurality of pistons are arranged in a circumferential direction in a cylinder block configured to rotate with a rotating shaft. Tip end portions of the pistons slide along the swash plate, and the pistons reciprocate. The swash plate is supported by a swash plate supporting portion so as to be able to tilt with respect to the rotating shaft. Further, a tilt adjustment driving portion (47) configured to change a tilt angle ¸ of the swash plate is included. The tilt adjustment driving portion (47) includes a tilt adjustment large-diameter cylinder chamber (42), a tilt adjustment small-diameter cylinder chamber (43), a tilt adjustment large-diameter piston configured to slide in the cylinder chamber (42) to change the tilt angle ¸ of the swash plate, and a tilt adjustment small-diameter piston configured to slide in the cylinder chamber (43) to change the tilt angle ¸ of the swash plate. A sliding surface of each of the inner peripheral surface (42a) of the cylinder chamber (42) and the inner peripheral surface (43a) of the cylinder chamber (43) includes a quenched portion (48) formed by quenching using laser light, the sliding surface being a surface on which the tilt adjustment piston slides. |
