Patent ID: 6119580
Filing Date: 2000-09-19
Classification: F03C,F04B,Y10T

Abstract:
A swash plate type hydraulic rotational machine having a cylindrical casing opened at one axial end, a rotational shaft rotatably mounted within said casing, a rotor mounted on said rotational shaft for rotation therewith and provided with a plural number of axial cylinders, a plural number of pistons having one end portions thereof slidably fitted in said cylinders of said rotor and the other end portions projected out of said cylinders, a plural number of shoes provided on projected ends of said pistons, a swash plate mounted within said casing on the side of projected ends of said pistons and having an inclined surface held in sliding contact with said shoes as said rotor is put in rotation, and a tilt actuator provided within said casing between said swash plate and the other end of said casing and arranged to move said swash plate into a tilted position with hydraulic fluid supplied and discharged thereto, characterized in that:said casing is formed out of a cast structural material containing metal pipes, said metal pipes being completely embedded in a body of said cast structural material on an outer peripheral side thereof and providing hydraulic passages on an inner peripheral side for use as conduits for supplying and discharging hydraulic fluid to and from said tilt actuator.