Bearings – Rotary bearing – Fluid bearing
Patent
1981-07-06
1983-11-29
Footland, Lenard A.
Bearings
Rotary bearing
Fluid bearing
384111, 384113, 384118, F16C 3206
Patent
active
044178239
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns hydrostatic guide bearings of a shaft, the journal of which is in the form of a sleeve, and a fluid pump for the realization of such a bearing.
Hydrostatic guide bearings are quite familiar to those in this art. They are generally defined according to the number of chambers disposed within the race concentrically surrounding the rotating journal of the shaft. A viscous fluid under pressure is admitted into the chambers to limit the friction between the journal and the race, and it leaves through openings provided for this purpose in the race at a certain distance from the chambers.
The axial length of the journal is sufficiently great with respect to the length of the shaft so that the line of the shaft will have a satisfactory dynamic behavior, and, in particular, so that the vibration level of the assembly will be less than a given threshold.
The present invention has as its object a hydrostatic guide bearing having the same goals, but whose journal has a smaller axial length.
According to the invention, in summary, the journal of the shaft takes on the form of a sleeve, and the bearing comprises a first and a second set of chambers placed within concentric races respectively opposite the internal wall and the external wall of the journal.
Toward the goal of improving the characteristics of operation of the bearing conforming to the invention, the chambers of the first set may be suitably displaced with respect to the chambers of the second set, both angularly and axially.
Such a bearing is intended particularly for guidance of the shaft of a fluid pump, for example a primary pump of a nuclear reactor. In this case, it is advantageous to draw the working fluid of the bearing from the pumped fluid, downstream of the pump, admitting ducts then being capable of directing the working fluid in a centripetal direction.
The invention will be better understood, and other goals, advantages and characteristics will appear more clearly from the reading of the description which follows of an example of realization of the invention, to which description are appended two figures of drawings.
FIG. 1 represents, in partial axial cutaway, a hydrostatic bearing conforming to the present invention.
FIG. 2 represents, in partial axial cutaway, a variation of the mode of realization represented in FIG. 1 of a hydrostatic bearing conforming to the present invention, and
FIG. 3 represents, in partial transverse cutaway along the line III--III of FIGS. 1 and 2, a preferred angular arrangement of the various chambers of the bearing.
Referring to FIG. 1, in which only a partial cross-section of a hydrostatic bearing has been represented because of the axial symmetry of the assembly, the shaft 1 is integrally attached to the sleeve 2 forming a journal for the bearing. The bearing comprises two concentric races 3 and 4 in which are disposed two sets of chambers 5 and 6. These chambers are respectively opposite the internal wall and the external wall of the sleeve 2.
The admission of the viscous fluid is attained by aid of the ducts 7, 8 and 9, with nozzles 10, 11 being provided between each admission duct and the corresponding chamber. The viscous fluid circulates because of the pressure from the chambers toward outlet ducts, between the wall of the journal and that of the race. Outlet ducts 12, 13 and 14, 15 are provided on one side and the other of the corresponding chamber 5, 6, in order to conduct the used fluid to a collector 16.
In the example represented, which is that of a fluid pump, the viscous fluid circulates in a centripetal fashion, with the collectors 16 disposed between the shaft 1 and the sleeve acting as a journal 2. However, this arrangement could be reversed.
In the example of a fluid pump, the viscous fluid used is advantageously constituted by the pumped fluid with admission ducts 7, 8 having their open end downstream of the pump; that is, in the portion where the fluid is under pressure.
In circulating within the bearing, the fluid depressurizes, and the collector 16, connected
REFERENCES:
patent: 2811109 (1957-10-01), Brill et al.
patent: 4330159 (1982-05-01), Kakimoto
Drevet Michel
Trouillet Jean
Footland Lenard A.
Jeumont Schneider Corporation
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