# US 4,396,302 A · Hydrostatic bearing with security of function

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- Number: US 4,396,302 A
- Document ID: US4396302A
- Status: Granted
- Kind: A
- Application number: 06/273,254
- Filed: 1981-06-12
- Granted: 1983-08-02
- Earliest claimed: 1980-06-17
- Assignees: Jeumont-Schneider Corporation
- Inventors: Michel Drevet; Jean Trouillet
- Web page: https://patentgrep.com/patent/US4396302A

## CPC

- F04D 29/047: hydrostatic; hydrodynamic
- F04D 29/061: {especially adapted for liquid pumps}
- F16C 32/064: {the liquid being supplied under pressure}
- F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02)
- F16C: SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS

## Abstract

In a hydrostatic bearing for pumps of fluid under pressure which is supplied by the pumped fluid, the operation of the bearing is ensured regardless of the conditions present in the pump. To this end, the nozzles of fluid supply of the openings of the race bearing are connected upstream to two compartments of the pump containing the fluid under two different pressures, through the intermediary of a ball valve, and two expansion chambers are arranged in the race on one side and the other of the openings and are connected downstream to the two compartments through the intermediary of ball valves.

## Claims

### Claim 1

A hydrostatic bearing for a fluid pump having two compartments containing fluid at two different pressures, the bearing comprising a race arranged between the two compartments and in which in disposed a plurality of openings and a plurality of nozzles connected to the openings for supplying fluid thereto, said nozzles being connected upstream of said openings to said compartments through first ball valve means controlled by the pressures in the two compartments, and a pair of expansion chambers disposed in said race on one side and the other of the said openings and being connected thereto, the expansion chambers being further connected downstream of said openings to said two compartments through second ball valve means controlled by the pressures in the two compartments.

### Claim 2

A hydrostatic bearing for a fluid pump having two compartments containing fluid at two different pressures, the bearing comprising a race arranged between the two compartments and having disposed therein a plurality of openings and a plurality of nozzles connected to the openings for supplying fluid thereto, said nozzles being connected upstream of said openings to the two compartments by first ball valve means controlled by the difference in pressures present in said compartments for allowing passage of the fluid coming from the compartment in which is present the higher pressure, while prohibiting any circulation of fluid from the compartment in which is present the lower pressure, expansion chambers for said fluid respectively on one side and the other of the said openings in the said race being connected downstream of the openings to said two compartments by second ball valve means controlled by the difference in pressures present in said compartments and arranged to allow the escape of the fluid coming from the said expansion chambers toward the compartment in which is present the lower pressure, while prohibiting any circulation of the fluid to the other compartment, in order to maintain a supply of fluid to the openings from the compartment in which the higher pressure is present and escape of fluid from the openings to the compartment in which the lower pressure is present, in order to ensure proper operation of the said bearing under all conditions.

### Claim 3

A hydrostatic bearing for a fluid pump having first and second compartments containing fluid at different pressures, the pump having a first operating condition at which the fluid pressure in the first compartment is higher than the fluid pressure in the second compartment and having a second operating condition at which the fluid pressure in the second compartment is higher than the fluid pressure in the first compartment, the bearing comprising a race positioned between the first and second compartments, the race having therein first fluid conduit means connecting the first and second compartments, an opening adjacent to a movable portion of the pump for receiving fluid, and a nozzle connecting the opening to the first fluid conduit means for supplying fluid thereto, and having second fluid conduit means connecting the first and second compartments to said opening, first valve means responsive to the pressures in the compartments for permitting fluid passage from the compartment having the higher pressure into the first conduit means and to the opening and for preventing passage of fluid from the first fluid conduit means to the compartment with the lower pressure, and second valve means responsive to the pressures in the compartments for permitting fluid passage from the opening and the second fluid conduit means to the compartment with the lower pressure while preventing passage of fluid from the compartment with the higher pressure to the second fluid conduit means.

### Claim 4 (depends on 3)

The bearing of claim 3, wherein the first valve means comprises a first ball valve disposed within the first fluid conduit means and operable for opening the first fluid conduit means to the compartment having the higher pressure while simultaneously closing the first fluid conduit means to the compartment having the lower pressure, and wherein the second valve means comprises second and third ball valves disposed within the second fluid conduit means and operable to open the second fluid conduit means to the compartment having the lower pressure while simultaneously closing the second fluid conduit means to the compartment having the higher pressure.

### Claim 5 (depends on 3)

The bearing of claim 3, wherein the second fluid conduit means comprises first and second fluid expansion chambers disposed at opposite sides of the race, each fluid expansion chamber being connected by a fluid passage to one of said compartments.