Patent ID: 6619937
Filing Date: 2003-09-16
Classification: F04C,F05C

Abstract:
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, 9â€²), and the section is made up of at least one roll (9â€²) 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.