Hydraulic machine
AssigneeSauer-Danfoss Holding A/S
InventorsWelm Friedrichsen, Hans-Erik Kiil, Claus Tjørnly Rasmussen
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Abstract
The invention concerns a hydraulic machine (1) with a tooth set (2), having a gear wheel (3), which is arranged to be rotating and orbiting in a toothed ring (4), the tooth set (2) being arranged between two plates (10, 11) in the axial direction. It is desired to extend the life of such a machine, also when operated with an impurified hydraulic fluid. For this purpose, at least a section (9′) of the circumferential surface of one of the two components, toothed ring (4) and gear wheel (3), is made of a material, which is substantially harder than the material of the part of the other component, gear wheel (3) and toothed ring (4), bearing on this section.
Claims13
A hydraulic machine with a tooth set, having a gear wheel, which is arranged to be rotating and orbiting in a toothed ring, the tooth set being arranged between two plates in an axial direction;
- at least a section of a circumferential surface of one of the two plates, a toothed ring (4) and a gear wheel (3), being made of a material which is substantially harder than the material of the part of the other plate, gear wheel and toothed ring, bearing on the section, characterised in that the toothed ring (4) has teeth which are formed by rolls (9, 9′), and the section is made up of at least one roll (9′) that is made of a ceramic material or has a surface layer of a ceramic material, which is harder than the material of which the gear wheel (3) is made.
Dependencies are inferred from the claim text.