Patent ID: 6450792
Filing Date: 2002-09-17
Classification: F01C,F04B,F04C,F05C

Abstract:
A hydraulic displacement machine including a hydraulic displacement pump, comprising:two components slidably movable relative to one another and each having a surface, at least one of said two components being hardened at least on said surface and formed of a sintered material containing predominantly ferrite and a constituent for improving sliding properties; a casing; an externally toothed pinion disposed in said casing and having tooth tips; and a ring wheel meshing with said pinion and having tooth tips, said two components being disposed in said casing for sealing off a high-pressure region from a low-pressure region of said casing along said tooth tips of said pinion and said ring wheel, and said casing, said pinion and said ring wheel defining an internal gear machine including an internal gear pump; wherein said sintered material contains preferably 15% to 25% copper.