Device for eliminating residual unbalance from a rotating element

DETAILED DESCRIPTION The sleeve 1 which carries a grinding wheel (not shown) is rotatably mounted on a stationary central shaft 2 by means of two hydrostatic bearings 3.
Said bearings are maintained in position within two bores 5 of the sleeve against two internal annular shoulders 6 by means of two nuts 7 which are screwed into the threaded ends of two bores 5.
The cylindrical radial bearing surface of each bearing 3 is designated by the reference 11 and the front axial-positioning face is designated by the reference 12; the corresponding bearing surfaces on the stationary central shaft 2 are designated respectively by the references 13 and 14.
Four flat portions 17 formed in the cylindrical bearing surface 13 of the stationary central shaft 2 (as also shown in FIG.
5) determine four chambers 18 in conjunction with the corresponding surface 11 of the bearing.
Said chambers are supplied with oil under pressure respectively by four nozzles 21 which are mounted radially within the shaft and open into an annular cylindrical chamber 22 formed between a bush 23 and a central tube 24.
The two bushes 23 of the two bearings are supported by a tube 25 constituted by a number of sections and forming an assembly, the two ends of which are supported within two components 26, 27 which are rigidly fixed respectively to the two ends of the stationary central shaft 2.
The tube 24 (to which further reference will be made hereinafter) is also supported at both ends within the two components 26, 27.
Oil under pressure is admitted into each chamber 22 through the annular cylindrical gap between the two tubes 24, 25 from a radial bore 28 of the end component 26.
An annular chamber 32 formed in the front face 12 of each bearing 3 is also supplied with oil under pressure from the annular chamber 22 by means of a radial nozzle 33 mounted within the stationary central shaft 2 and by means of a hole 34 which has its opening on the front face 14 of said shaft opposite to the annular chamber 32 of the bearing.
Oil leakages which escape between the bearing surfaces pass within annular return channels 37, 38, 39 and through holes 37A, 38A, 39A which are formed radially in the stationary central tubular shaft, then within the bore 4 of said shaft and escape from said bore through a radial hole 42