SWASH PLATE TYPE HYDRAULIC ROTATING MACHINE AND METHOD OF MANUFACTURING CASING FOR SAME

摘要

When molding a casting (77) which is a material for a casing body (62), metallic pipes (76) are integrally cast which are to make oil passages (64) for inclinedly rotating actuators (14) for a swash plate (12). The metallic pipes (76) are positioned in a mold (71) for casting the casing body (62), and a molten metallic material for casting is poured to mold the casting (77). Inner and outer peripheral surfaces of the casting (77) and the metallic pipes (76) are subjected to finish processing to manufacture the casing body (62) for a hydraulic motor (61). Thus pipings (63) of the metallic pipe can be embedded in the casing body (62) to extend from an opening end of a cylindrical section (62A) to cylinder sections (15) for the inclinedly rotating actuators (14) provided on a bottom section (62B), and inner peripheral portions of the pipings (63) can be formed to serve as the oil passages (64), through which an oil is supplied and discharged for control of inclined rotation.