US5222815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bearings having beam mounted bearing pads and methods of making same
Assignee: KMC BEARINGS Inc
•
Filing: 1990-08-06
•
Granted: 1993-06-29
•
Expires: 2010-08-06
Abstract
Abstract A hydrodynamic thrust, journal or combined radial and thrust bearing and methods of manufacturing the same. The bearing includes a bearing pad structure that may change shape and move in any direction (six degrees of freedom) to optimize formation of a converging wedge for hydrodynamic operation, equalization of load on the bearing pads in thrust bearings and to adjust for any shaft misalignment. The bearing pad may be formed so as to contact the shaft in the installed state and to deflect under fluid film pressure. The pad is separated from the support member by a support structure which includes one or more beam-like members. The support structure preferably includes a primary support portion, a secondary support portion and a tertiary support portion. The beams allow deflection of the pad by either deflecting or twisting in a torsional mode. The bearing pad support structure may include portions which are fluid dampened. The bearing may be made self lubricating through the provision of a lubricant absorbing and releasing material in the spaces between the bearing pads or within the support structure. The bearings may be made of a wide variety of materials including, plastics, ceramics, powdered metals, composites and metals. The bearings may be manufactured by simple molding using a two-piece camless mold, injection molding, casting, powdered metal die casting, extrusion, electric discharge or laser cutting.
Inventors
- 👤 Russell D. Ide
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:44
CPC Classifications
F; F16; F16C; F16C17/00; F16C17/04; F16C17/06; F16C17/065; F16C17/02; F16C17/03; F16C17/035; F16F; F16F15/00; F16F15/02; F16F15/023; F16F15/0237; F16C2300/00; F16C2300/02; F16C27/00; F16C27/02; F16C27/08
Claims Analysis
Total Claims: 44
Claim 1
Independent Claim
194 words
A hydrodynamic bearing adapted to support a rotating shaft on a pressurized fluid film, the bearing comprising a unitary cylindrical journal, the journal comprising a radially outer surface and a radially inner surface; the journal being formed with a plurality of radial cuts extending radially outward of the inner surface of the housing and a plurality of circumferential cuts in continuance of the radial cuts; the radial and circumferential cuts together defining a plurality of circumferentially arranged bearing pads and a unitary support structure comprising at least one integral beam-like member that supports each pad, wherein each pad comprises circumferentially extending and radially extending edges and a shaft engaging face surface, one of the radially extending edges of each pad comprising a leading edge and another radially extending edge of each pad comprising a trailing edge; said bearing being designed such that there is an open space between every point on the radially inner surface and the radially outer surface the support structure being designed such that as the shaft begins to rotate, the fluid pressure of the fluid film increases causing the pad to form a converging wedge with respect to the shaft.
Claim 2
Dependent Claim
194 words
A hydrodynamic bearing adapted to support a rotating shaft on a pressurized fluid film, the bearing comprising a unitary cylindrical journal, the journal comprising a radially outer surface and a radially inner surface; the journal being formed with a plurality of radial cuts extending radially outward of the inner surface of the housing and a plurality of circumferential cuts in continuance of the radial cuts; the radial and circumferential cuts together defining a plurality of circumferentially arranged bearing pads and a unitary support structure comprising at least one integral beam-like member that supports each pad, wherein each pad comprises circumferentially extending and radially extending edges and a shaft engaging face surface, one of the radially extending edges of each pad comprising a leading edge and another radially extending edge of each pad comprising a trailing edge; said bearing being designed such that there is an open space between every point on the radially inner surface and the radially outer surface the support structure being designed such that as the shaft begins to rotate, the fluid pressure of the fluid film increases causing the pad to form a converging wedge with respect to the shaft.
Claim 3
Dependent Claim
40 words
The hydrodynamic bearing of claim 1, wherein the unitary support structure comprises a plurality of circumferential beams, each circumferential beam having one end connected to a bearing pad through a stub portion and a second end supported as a cantilever.
Claim 4
Dependent Claim
19 words
The bearing of claim 2, wherein the second end is closer to the leading edge than the trailing edge.
Claim 5
Dependent Claim
20 words
The bearing of claim 2, wherein the second end is closer to the trailing edge than to the leading edge.
Claim 6
Dependent Claim
31 words
The hydrodynamic bearing of claims 1, wherein the unitary support structure comprises two radially extending beams supporting each pad, each of the radially extending beams being supported by a circumferential beam.
Claim 7
Dependent Claim
38 words
The hydrodynamic bearing of claim 3, wherein the circumferential beam supporting one of the two radially extending beams extends toward the leading edge and the circumferential beam supporting the other radially extending beam extends toward the trailing edge.
Claim 8
Dependent Claim
24 words
The hydrodynamic bearing of claim 1, wherein the unitary support structure comprises: a plurality of axially extending beams, adapted for torsional twisting under load.
Claim 9
Dependent Claim
21 words
The hydrodynamic bearing of claim 7, wherein the axially extending beams extend axially from a circumferential edge of a bearing pad.
Claim 10
Dependent Claim
51 words
The hydrodynamic bearing of claim 1, wherein the unitary support structure comprises a plurality of radially extending beams, each radially extending beam having one end in direct contact with the bearing pad, and a plurality of circumferential beams, each circumferential beam being connected to a bearing pad by a stub portion.
Claim 11
Dependent Claim
30 words
The hydrodynamic bearing of claim 1, wherein the unitary support structure comprises a plurality of angled beams and wherein each pad is supported by two beams angled toward each other.
Claim 12
Dependent Claim
51 words
The hydrodynamic bearing of claim 1, wherein the unitary support structure comprises a plurality of radially extending beams, each radially extending beam supporting one of the bearing pads and the radially extending beam having a radial dimension which is greater than its circumferential dimension so that the beam bends under loading.
Claim 13
Dependent Claim
30 words
The bearing of claim 11, wherein a central region of the radial beam is undercut so that the axial ends of the radial support the central region for radial deflection.
Claim 14
Dependent Claim
31 words
The hydrodynamic bearing of claim 1, wherein the unitary support structure comprises at lest one beam supporting each pad and a membrane supporting each of the beams which support the pads.
Claim 15
Dependent Claim
14 words
The bearing of claim 13, wherein the membrane is supported by two circumferential beams.
Claim 16
Dependent Claim
16 words
The bearing of claim 13, wherein each pad is supported by a single radially extending beam.
Claim 17
Dependent Claim
18 words
The bearing of claim 1, wherein a single cylindrical membrane supports all of said plurality of bearing pads.
Claim 18
Dependent Claim
22 words
The bearing of claim 1 wherein said pads are formed and supported so as to deflect into an airfoil shape under load.
Claim 19
Dependent Claim
22 words
The bearing of claim 1 wherein said pads are formed and supported so as to deflect into a channel shape under load.
Claim 20
Dependent Claim
17 words
The bearing of claim 1 wherein a porous plastic material fills the spaces between the bearing pads.
Claim 21
Dependent Claim
18 words
The bearing of claim 19 wherein the porous plastic material is capable of absorbing and releasing liquid lubricant.
Claim 22
Dependent Claim
38 words
The bearing of claim 19 wherein the porous plastic material is loaded with liquid lubricant such that when the support structure of the bearing deflects, liquid lubricant is released from the porous plastic onto the bearing pad surface.
Claim 23
Dependent Claim
16 words
The bearing of claim 1 wherein the radial cuts are filled with a porous plastic material.
Claim 24
Dependent Claim
38 words
The bearing of claim 22 wherein the porous plastic is loaded with a lubricant and wherein under loading, deflection of the bearing pads and support structure causes the porous plastic to release lubricant onto the baring pad surface.
Claim 25
Dependent Claim
210 words
A unitary hydrodynamic bearing for supporting a shaft rotating in a housing comprising a cylindrical journal having a cylindrical bore and a plurality of thin radial and circumferential cuts formed therein, said bore and said cuts defining a plurality of bearing pad means, and a unitary support structure for supporting each of said bearing pad means; each of said pad means comprising a load engaging face member, said face member being separated from said housing by the unitary support structure, the unitary support structure comprising at least one beam-like member having at least a portion thereof extending substantially parallel to a plane that is tangent to at least one line of contact with said face member, said face member having a load engaging surface to operatively support an opposing relatively moving part of said shaft, said face member being adapted under the action of friction and pressure on said load engaging face surface to move relative to the housing to form a converging wedge shape to operatively support said shaft part in a bearing relationship, said support structures supporting said bearing pad for at least one of radial deflection and torsional twisting; wherein said bearing pad means, said unitary support structures and said housing are formed as a single piece.
Claim 26
Dependent Claim
210 words
A unitary hydrodynamic bearing for supporting a shaft rotating in a housing comprising a cylindrical journal having a cylindrical bore and a plurality of thin radial and circumferential cuts formed therein, said bore and said cuts defining a plurality of bearing pad means, and a unitary support structure for supporting each of said bearing pad means; each of said pad means comprising a load engaging face member, said face member being separated from said housing by the unitary support structure, the unitary support structure comprising at least one beam-like member having at least a portion thereof extending substantially parallel to a plane that is tangent to at least one line of contact with said face member, said face member having a load engaging surface to operatively support an opposing relatively moving part of said shaft, said face member being adapted under the action of friction and pressure on said load engaging face surface to move relative to the housing to form a converging wedge shape to operatively support said shaft part in a bearing relationship, said support structures supporting said bearing pad for at least one of radial deflection and torsional twisting; wherein said bearing pad means, said unitary support structures and said housing are formed as a single piece.
Claim 27
Dependent Claim
164 words
A one-piece bearing for supporting a shaft, said bearing having an inner periphery and an outer periphery and comprising a plurality of circumferentially spaced bearing pads, each said pad including a leading edge, a trailing edge and a circumferentially curved pad face extending between said leading edge and said trailing edge; a support structure comprising a plurality of support members located radially outwardly of said bearing pads, the support structure comprising a network of interconnected support members which are arranged such that there is a radial space between every point on each bearing pad surface and the outer periphery of the bearings and supporting said bearing pad for movement with respect to said housing with six degrees of freedom; wherein the bearing pads and support structure are formed of a single piece of material wherein said bearing pad face has an axially extending circumferential centerline and said support portion supports said bearing pad at a point between said circumferential centerline and said trailing edge.
Claim 28
Dependent Claim
164 words
A one-piece bearing for supporting a shaft, said bearing having an inner periphery and an outer periphery and comprising a plurality of circumferentially spaced bearing pads, each said pad including a leading edge, a trailing edge and a circumferentially curved pad face extending between said leading edge and said trailing edge; a support structure comprising a plurality of support members located radially outwardly of said bearing pads, the support structure comprising a network of interconnected support members which are arranged such that there is a radial space between every point on each bearing pad surface and the outer periphery of the bearings and supporting said bearing pad for movement with respect to said housing with six degrees of freedom; wherein the bearing pads and support structure are formed of a single piece of material wherein said bearing pad face has an axially extending circumferential centerline and said support portion supports said bearing pad at a point between said circumferential centerline and said trailing edge.
Claim 29
Dependent Claim
194 words
A one-piece bearing for supporting a shaft, said bearing having an inner periphery and an outer periphery and comprising a plurality of circumferentially spaced bearing pads, each said pad including a leading edge, a trailing edge and a circumferentially curved pad face extending between said leading edge and said trailing edge; a support structure comprising a plurality of support members located radially outwardly of said bearing pads, the support structure comprising a network of interconnected support members which are arranged such that there is a radial space between every point on each bearing pad surface and the outer periphery of the bearings and supporting said bearing pad for movement with respect to said housing with six degrees of freedom; wherein the bearing pads and support structure are formed of a single piece of material and the bearing is supported so as to deflect under loading about a point between said leading edge and said trailing edge such that said trailing edge deflects radially inward and said leading edge deflects radially outward such that said trailing edge is between two to five times closer to said shaft than said leading edge is to said shaft.
Claim 30
Dependent Claim
194 words
A one-piece bearing for supporting a shaft, said bearing having an inner periphery and an outer periphery and comprising a plurality of circumferentially spaced bearing pads, each said pad including a leading edge, a trailing edge and a circumferentially curved pad face extending between said leading edge and said trailing edge; a support structure comprising a plurality of support members located radially outwardly of said bearing pads, the support structure comprising a network of interconnected support members which are arranged such that there is a radial space between every point on each bearing pad surface and the outer periphery of the bearings and supporting said bearing pad for movement with respect to said housing with six degrees of freedom; wherein the bearing pads and support structure are formed of a single piece of material and the bearing is supported so as to deflect under loading about a point between said leading edge and said trailing edge such that said trailing edge deflects radially inward and said leading edge deflects radially outward such that said trailing edge is between two to five times closer to said shaft than said leading edge is to said shaft.
Claim 31
Dependent Claim
212 words
A hydrodynamic bearing adapted to support a shaft, said bearing comprising a unitary cylindrical housing, said housing comprising a radially outer surface and a radially inner surface; said housing being formed with a plurality of radial cuts extending radially outward of the inner surface of the housing and a plurality of circumferential cuts in continuance of said radial cuts; said radial and circumferential cuts together defining a plurality of circumferentially arranged bearing pads and a unitary support structure comprising a single integral beam-like member that supports each pad, the beam extending away from the pad and being dimensioned so as to support the pads for movement in the tilt pad regime with minimal cross coupling stiffness wherein each pad comprises axially extending and radially extending edges and a circumferential shaft engaging face surface, one of said axially extending edges of each pad comprising a leading edge and another axially extending edge of each pad comprising a trailing edge, the face of the pad being adapted under the action of friction and pressure on said surface to rock relative to the support member whereby the trailing edge of the face surface of the pad is moved radially inward toward said shaft and said leading edge is moved radially outward away from said shaft.
Claim 32
Dependent Claim
212 words
A hydrodynamic bearing adapted to support a shaft, said bearing comprising a unitary cylindrical housing, said housing comprising a radially outer surface and a radially inner surface; said housing being formed with a plurality of radial cuts extending radially outward of the inner surface of the housing and a plurality of circumferential cuts in continuance of said radial cuts; said radial and circumferential cuts together defining a plurality of circumferentially arranged bearing pads and a unitary support structure comprising a single integral beam-like member that supports each pad, the beam extending away from the pad and being dimensioned so as to support the pads for movement in the tilt pad regime with minimal cross coupling stiffness wherein each pad comprises axially extending and radially extending edges and a circumferential shaft engaging face surface, one of said axially extending edges of each pad comprising a leading edge and another axially extending edge of each pad comprising a trailing edge, the face of the pad being adapted under the action of friction and pressure on said surface to rock relative to the support member whereby the trailing edge of the face surface of the pad is moved radially inward toward said shaft and said leading edge is moved radially outward away from said shaft.
Claim 33
Dependent Claim
28 words
A bearing as in claim 27, wherein said at least one integral beam-like member comprises a single beam that supports the pad and twists in a torsional mode.
Claim 34
Dependent Claim
24 words
A bearing as in claim 27, wherein said beam-like member comprises a single beam that supports the pad and deflects in a bending mode.
Claim 35
Dependent Claim
39 words
A bearing as in claim 27, wherein said unitary support structures comprises single beam-like member for supporting each said pad along a pad support surface, said pad support surface being spaced from said axially extending and radially extending edges.
Claim 36
Dependent Claim
23 words
The hydrodynamic bearing of claim 27, wherein the unitary support structure comprises a single radially extending beam supporting each of the bearing pads.
Claim 37
Dependent Claim
22 words
The hydrodynamic bearing of claim 31 further comprising a single continuous membrane, said continuous membrane supporting each of the radially extending beams.
Claim 38
Dependent Claim
37 words
The hydrodynamic bearing of claim 32, further comprising two circumferential beams supporting the membrane so that there is an open space between every point on the radially inner surface and every point on the radially outer surface.
Claim 39
Dependent Claim
20 words
The bearing of claim 27 wherein a porous plastic material fills at least the space between the spaced bearing pads.
Claim 40
Dependent Claim
23 words
A bearing as in claim 27, wherein the bearing pad is supported by the unitary support structure so as to flatten under load.
Claim 41
Dependent Claim
31 words
A bearing as in claim 27, wherein the pad is defined by said radial and circumferential cuts so as to deflect under loading, said deflections modifying the eccentricity of the bearing.
Claim 42
Dependent Claim
16 words
A bearing as in claim 27, further comprising a fluid lubricant located within the support structure.
Claim 43
Dependent Claim
26 words
The bearing as in claim 27, wherein said pad is supported for deflection about a point located circumferentially between said leading edge and said trailing edge.
Claim 44
Dependent Claim
37 words
The bearing as in claim 27, wherein said pad has an axially extending circumferential centerline, said pad being supported such that loads applied thereto act at a point located between said circumferential centerline and said trailing edge.
References Cited (Backward Citations)
US1991461A
Cited
US2110464A
Cited
US2347663A
Cited
US2314703A
Cited
US2424028A
Cited
FR1010959A
Cited
DE879116C
Cited
US2906571A
Cited
US2778696A
Cited
US2890916A
Cited
US3062598A
Cited
US3107955A
Cited
US3132908A
Cited
US3160450A
Cited
US3142519A
Cited
US3384425A
Cited
US3424505A
Cited
US3460875A
Cited
US3677612A
Cited
US3586401A
Cited
US3675977A
Cited
US3687506A
Cited
US3791703A
Cited
US3913989A
Cited
US3881791A
Cited
US3899224A
Cited
US3829180A
Cited
US3902770A
Cited
US3951475A
Cited
US3944304A
Cited
US3902771A
Cited
US3930691A
Cited
US4005914A
Cited
US3954309A
Cited
US3971602A
Cited
US4178046A
Cited
US4118079A
Cited
US4268094A
Cited
US4099799A
Cited
US4319790A
Cited
US4133585A
Cited
US4243274A
Cited
US4335925A
Cited
US4227752A
Cited
US4654939A
Cited
US4459047A
Cited
US4277113A
Cited
US4325585A
Cited
US4290656A
Cited
US4253714A
Cited
JPS5758124A
Cited
US4382199A
Cited
US4403873A
Cited
US4560014A
Cited
US4435839A
Cited
US4639146A
Cited
US4583870A
Cited
US4515486A
Cited
US4526482A
Cited
US4496251A
Cited
US4668106A
Cited
US4647227A
Cited
GB2173881A
Cited
US4671677A
Cited
EP0206686A2
Cited
US4676668A
Cited
US4699525A
Cited
US4657411A
Cited
US4726695A
Cited
US4725151A
Cited
US4738550A
Cited
EP0283982A2
Cited
EP0283981A2
Cited
EP0283980A2
Cited
EP0343620A2
Cited
US4767222A
Cited
US4767221A
Cited
US4738453A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |