Hydraulic machine

Abstract

The invention concerns a hydraulic machine ( 1 ) with an externally toothed gear wheel ( 2 ) and an internally toothed ring ( 3 ), which is made of a sintered material or of a ceramic material. It is endeavored to provide good operation behaviour at low costs. For this purpose, the toothed ring ( 3 ) is provided with a sealing element ( 7 ) in the area of its outer circumference.

1 . A hydraulic machine with an externally toothed gear wheel and an internally toothed ring, wherein in the area of its outer circumference the toothed ring is provided with a sealing element. 
   
   
       2 . The machine according to  claim 1 , wherein the sealing element surrounds the toothed ring. 
   
   
       3 . The machine according to  claim 1 , wherein the sealing element has a higher tensile strength than the toothed ring. 
   
   
       4 . The machine according to  claim 1 , wherein the sealing element is, at least partly, made of steel. 
   
   
       5 . The machine according to  claim 3 , wherein the sealing element comprises carbon fibres, glass fibres or plastic fibres. 
   
   
       6 . The machine according to  claim 1 , wherein the sealing element is provided with several layers, which follow each other in the radial direction of the toothed ring. 
   
   
       7 . The machine according to  claim 6 , wherein at least two layers have different properties. 
   
   
       8 . The machine according to  claim 1 , wherein the sealing element is made as a closed ring. 
   
   
       9 . The machine according to  claim 1 , wherein the sealing element has a winding. 
   
   
       10 . The machine according to  claim 1 , wherein the toothed ring has several sections bearing on each other in the axial direction. 
   
   
       11 . The machine according to  claim 10 , wherein the sealing element overlaps at least one abutting joint between two sections. 
   
   
       12 . The machine according to  claim 10 , wherein the sections have the same axial length. 
   
   
       13 . The machine according to  claim 10 , wherein the sections are clamped together axially by at least one bolt. 
   
   
       14 . The machine according to  claim 13 , wherein the sections are clamped together by several bolts, at least one bolt being guided through a through opening, whose circumferential wall is only partly (A, B) in contact with the bolt. 
   
   
       15 . The machine according to  claim 14 , wherein several bolts are provided, the part (A) of the circumference at n bolts being 360°/n. 
   
   
       16 . The machine according to  claim 1 , wherein the toothed ring comprises at least one control channel. 
   
   
       17 . The machine according to  claim 1 , wherein a pressure connection ends between the toothed ring and the sealing element. 
   
   
       18 . The machine according to  claim 1 , wherein the toothed ring is made as a sintered element or a ceramic element. 
   
   
       19 . The machine according to  claim 1 , wherein the toothed ring is made of a light metal or a plastic material.