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AssigneeHitachi Construction Machinery Co., Ltd.
InventorsHitoshi Sato, Hitoshi Kagiwada, Kenichi Kimura
Estimating the term…
At the time of casting a structural material for a casing, metal pipes to be used as passages to and from a tilt actuator of a swash plate are integrally embedded in a cast body of the structural material. In a casting stage of the structural material for the casing, metal pipes are set in position within a casting mold, and then molten metallic material is introduced into the mold. A main casing for a hydraulic motor is formed out of the cast structural material by finishing its inner and outer peripheral surfaces and outer ends of embedded metal pipes. The resulting casing has the metal pipe conduits embedded in its cylindrical body portion from its open end toward its bottom portion with cylinders for a tilt actuator, the embedded metal pipe conduits providing passages on the inner peripheral side for supplying and discharging tilt control hydraulic fluid to and from the tilt actuator.
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:
A method for manufacturing a casing for a swash plate type hydraulic rotational machine having within a casing a rotational shaft, a rotor rotatable integrally with said rotational shaft and provided with a plural number of axial cylinders, a plural number of pistons slidably fitted in the respective cylinders of said rotor, a plural number of shoes provided on projected ends of the respective pistons, a swash plate located face to face with the projected ends of said pistons and held in sliding contact with the shoes as the rotor is put in rotation, and a tilt actuator for driving the swash plate into tilted positions in response to supplied and discharged hydraulic fluid, characterized in that said method comprises the steps of:
Dependencies are inferred from the claim text.