US4043613A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrostatic bearing
Assignee: New Invent SA
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Filing: 1975-09-26
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Granted: 1977-08-23
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Expires: 1995-09-26
Abstract
Abstract In a hydrostatic bearing there is provided in known manner pairs of balancing pockets between the coacting bearing surfaces. To counteract the bearing load the pockets of each pair is fed with pressure fluid through a new combined throttle valve which not only distributes the flow of pressure fluid but also its throttling or constricting effect between the pockets of the pair. The valve contains a freely movable roller element cooperating with two pairs of diametrically opposed ports in the valve housing, the ports of one pair individually communicating with each its pocket of the pair of pockets, the ports of the second pair communicating with a pressure source or pump and a low pressure outlet or sump, respectively.
Inventors
- 👤 Lennart Werner Freese
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:40
CPC Classifications
F; F16; F16C; F16C32/00; F16C32/06; F16C32/0629; F16C32/064; F16C32/0644
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
332 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein the valve means includes a valve element in the shape of a cylindrical body or roller which is accomodated freely movable in a cylindrical valve chamber, the diameter of which somewhat exceeds that of the element, so that a clearance or gap is formed between the element and the chamber wall, in which the chamber has a set of four openings for coacting with the valve element, which is arranged to cover the openings to a varying degree with its curved surface, two opposing openings forming bearing ports each in communication with a bearing pocket while the two remaining openings form a pressure port and an outflow port respectively in communication with the pressure source and a low pressure area such as an outflow or a sump, so that the pressure fluid from the pressure port is distributed on either side of the valve element to the bearing ports through the gaps between the element and the chamber wall, which gaps are varied by the movement of the element, and thus the degree of constriction of the fluid as well as the pressure medium itself being distributed between the pockets.
Claim 2
Dependent Claim
332 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein the valve means includes a valve element in the shape of a cylindrical body or roller which is accomodated freely movable in a cylindrical valve chamber, the diameter of which somewhat exceeds that of the element, so that a clearance or gap is formed between the element and the chamber wall, in which the chamber has a set of four openings for coacting with the valve element, which is arranged to cover the openings to a varying degree with its curved surface, two opposing openings forming bearing ports each in communication with a bearing pocket while the two remaining openings form a pressure port and an outflow port respectively in communication with the pressure source and a low pressure area such as an outflow or a sump, so that the pressure fluid from the pressure port is distributed on either side of the valve element to the bearing ports through the gaps between the element and the chamber wall, which gaps are varied by the movement of the element, and thus the degree of constriction of the fluid as well as the pressure medium itself being distributed between the pockets.
Claim 3
Dependent Claim
39 words
A hydrostatic bearing as claimed in claim 1, wherein the four ports are equally distributed along the circumference of the chamber with their central points in a common plane at right angles to the longitudinal axis of the chamber.
Claim 4
Dependent Claim
35 words
A hydrostatic bearing as claimed in claim 1, wherein the valve chamber contains a plurality of said valve elements arranged coaxially side by side, each said valve element coacting with a set of said ports.
Claim 5
Dependent Claim
138 words
A hydrostatic bearing as claimed in claim 1, wherein the valve chamber is closed at one end so that a space if formed between the closed end or bottom of the chamber and the adjacent end of the valve element, said space being in communication with the ports through the gap between the valve element and the chamber wall, while the opposite end of the chamber is in communication with a low pressure area, a spring means being arranged to bias the valve element in an axial direction towards the closed end of the chamber against the pressure prevailing in said space according as to how the pressure varies at the said gap, so that the valve element is also exposed to an axial movement with a cleaning action besides its radial movement for flow and constriction distribution.
Claim 6
Dependent Claim
185 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein the bearing is in the form of a double-acting axial bearing comprising a bearing means having radial bearing surfaces, and wherein the bearing means is arranged to coact with a least said pair of bearing pockets, said pockets being disposed in opposing relationship.
Claim 7
Dependent Claim
185 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein the bearing is in the form of a double-acting axial bearing comprising a bearing means having radial bearing surfaces, and wherein the bearing means is arranged to coact with a least said pair of bearing pockets, said pockets being disposed in opposing relationship.
Claim 8
Dependent Claim
182 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein the bearing is in the form of a radial bearing means comprising shaft means having axial bearing surfaces, and wherein the shaft means is arranged for coaction with said pair of bearing pockets, said pockets being disposed in opposing relationship.
Claim 9
Dependent Claim
182 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein the bearing is in the form of a radial bearing means comprising shaft means having axial bearing surfaces, and wherein the shaft means is arranged for coaction with said pair of bearing pockets, said pockets being disposed in opposing relationship.
Claim 10
Dependent Claim
202 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure cuased by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein said bearing is in the form of a single-acting axial bearing for taking up a tipping moment and includes a first bearing means with a radial bearing surface, the bearing means being arranged to coact with at least two said bearing pockets distributed peripherally in an opposing second bearing means, said bearing pockets each being connected to said valve means.
Claim 11
Dependent Claim
202 words
A hydrostatic bearing having at least one pair of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop a counteracting pressure to the bearing load in a manner known per se, wherein the bearing pockets are supplied with pressure fluid through a valve means for throttling and distributing the fluid, the valve means being adapted to distribute, under constriction, the pressure fluid from the pressure source between the pockets in such a way that the valve means (1) reduces its throttling effect on the flow to a pocket if the pressure cuased by the bearing load in this pocket rises and (2) increases its throttling effect on the flow to a pocket if the pressure caused by the bearing load in this pocket decreases, comprising the improvement wherein said bearing is in the form of a single-acting axial bearing for taking up a tipping moment and includes a first bearing means with a radial bearing surface, the bearing means being arranged to coact with at least two said bearing pockets distributed peripherally in an opposing second bearing means, said bearing pockets each being connected to said valve means.
Claim 12
Dependent Claim
88 words
A hydrostatic bearing as claimed in claim 8 for use in a hydraulic axial piston machine, whereat the first bearing means comprises the rotating cylinder drum of the machine and the opposing second bearing means comprises the valve plate which is provided with valve ports, wherein the valve plate is provided with two pairs of said bearing pockets therein, and wherein said valve means includes at least two distributing throttle valves each having two bearing ports which are individually each in communication with one of said bearing pockets.
Claim 13
Dependent Claim
75 words
A hydrostatic bearing as claimed in claim 8, wherein one distributing throttle valve has a pressure support port which is in communication with one of the valve ports of the valve plate, wherein the other distributing throttle valve has a pressure supply port which is in communication with the second valve port of the valve plate, and wherein the outflow ports of both valves ae in communication with a sump or a low pressure area.
Claim 14
Dependent Claim
98 words
A hydrostatic bearing as claimed in claim 8, wherein a pressure port of each distributing throttle valve is in communication with the high pressure valve port of the valve plate while an outflow port of each valve is in communication with the unpressurized or low pressure valve port of the valve plate, the pressure and outflow ports of the distributing throttle valves being caused to change function if the valve ports of the valve plate change functions, i.e. if the high pressure port becomes the low pressure one and the low pressure port becomes the high pressure one.
Claim 15
Dependent Claim
272 words
A distributing throttle valve for hydrostatic bearings of the kind having one or more pairs of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop in the pockets a counteracting pressure to the bearing load in a manner known per se, each pair of bearing pockets being supplied with pressure fluid through one distributing throttle valve, which thus is adapted to distribute, under constriction, the pressure medium from the pressure source between the pockets of the pair in such a way that the valve reduces its throttling effect on the flow to one of the pockets if the pressure caused by the bearing load in this pocket raises while it increases its throttling effect on the flow to the other pocket, comprising the improvement wherein the distributing throttle valve includes a valve element in the shape of a cylindrical body or roller which is accomodated freely movable in a cylindrical valve chamber, the diameter of which somewhat exceeds that of the element, so that a clearance or gap is formed between the element and the chamber wall, said chamber having two pairs of opposing openings forming a ring about the valve element for coacting with said valve element, which valve element is arranged to cover the openings to a varying degree with its curved surface, the one pair of opposing openings forming bearings ports each in communication with a bearing pocket while the other pair of opposing openings form a pressure port and an outflow port respectively in communication with the pressure source and a low pressure area.
Claim 16
Dependent Claim
272 words
A distributing throttle valve for hydrostatic bearings of the kind having one or more pairs of bearing pockets formed between the coacting surfaces of the bearing and which are supplied with pressure fluid from a pressure source to develop in the pockets a counteracting pressure to the bearing load in a manner known per se, each pair of bearing pockets being supplied with pressure fluid through one distributing throttle valve, which thus is adapted to distribute, under constriction, the pressure medium from the pressure source between the pockets of the pair in such a way that the valve reduces its throttling effect on the flow to one of the pockets if the pressure caused by the bearing load in this pocket raises while it increases its throttling effect on the flow to the other pocket, comprising the improvement wherein the distributing throttle valve includes a valve element in the shape of a cylindrical body or roller which is accomodated freely movable in a cylindrical valve chamber, the diameter of which somewhat exceeds that of the element, so that a clearance or gap is formed between the element and the chamber wall, said chamber having two pairs of opposing openings forming a ring about the valve element for coacting with said valve element, which valve element is arranged to cover the openings to a varying degree with its curved surface, the one pair of opposing openings forming bearings ports each in communication with a bearing pocket while the other pair of opposing openings form a pressure port and an outflow port respectively in communication with the pressure source and a low pressure area.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |