US3721161A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axial piston hydraulic apparatus
Assignee: Von Roll AG
•
Filing: 1970-12-24
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Granted: 1973-03-20
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Expires: 1990-12-24
Abstract
Abstract To decrease mechanical loading on the roller thrust bearings in hydraulic pressure fluid apparatus, a hydrostatic axial slide bearing is provided, having a rotating part with an axially directed face secured to the rotating elements of the apparatus; and a stator part, formed as an axially movable element, such as a piston, within a cylinder which has pressure fluid applied thereto from a pressure fluid tap of the apparatus, the piston being formed with an opening, preferably including a choke, through which pressure fluid is applied in the region between the piston and the axially facing surface of the rotor element, to provide a counterforce against the mechanical force exerted against the thrust bearing.
Inventors
- 👤 G Bobst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 08:43
CPC Classifications
F; F01; F01B; F01B3/00; F01B3/0032; F01B3/0044; F01B3/0064; F01B3/0067; F01B3/007; F01B3/0073; F16; F16C; F16C39/00; F16C39/04; F16C19/00; F16C19/54; F16C19/546; F16C19/547; F16C19/548; F16C19/56; F16C2360/00; Y; Y10; Y10S; Y10S92/00; Y10S92/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
223 words
In an axial piston hydraulic apparatus having a pistoncylinder unit (10, 12); a source of hydraulic pressure fluid (T); a housing (1); a drive shaft (4) extending through said housing; rolling contact bearing means (5, 50) mounted in said housing and guiding the rotational movement of said shaft in said housing; and a hydrostatic slide bearing (20, 20'', 20''''), said apparatus comprising a rotatable bearing element (21, 51) rotatable with the shaft (4) and having a surface transverse to the direction of axial thrust on the shaft; a ring-shaped non-rotatable bearing element (23, 52) fitted into the housing and having one surface facing the surface of said rotatable bearing element and an opposite surface facing the inside of the housing; means (26, 30, 54) introducing pressure fluid from said source into the housing and against said opposite surFace of the nonrotatable bearing element, the housing forming conjointly with said non-rotatable bearing element a cylinder-piston arrangement (23, 24); and pressure fluid conduction means (27, 55) including choke means (55) formed in the pressure fluid conducting means extending in axial direction through said ring-shaped nonrotatable bearing element (23, 52) and introducing pressure fluid between the transverse surface of the rotatable bearing element and one facing surface of the non-rotatable bearing element to provide for axial counter pressure and unloading force acting on the roller bearing.
Claim 2
Dependent Claim
223 words
In an axial piston hydraulic apparatus having a pistoncylinder unit (10, 12); a source of hydraulic pressure fluid (T); a housing (1); a drive shaft (4) extending through said housing; rolling contact bearing means (5, 50) mounted in said housing and guiding the rotational movement of said shaft in said housing; and a hydrostatic slide bearing (20, 20'', 20''''), said apparatus comprising a rotatable bearing element (21, 51) rotatable with the shaft (4) and having a surface transverse to the direction of axial thrust on the shaft; a ring-shaped non-rotatable bearing element (23, 52) fitted into the housing and having one surface facing the surface of said rotatable bearing element and an opposite surface facing the inside of the housing; means (26, 30, 54) introducing pressure fluid from said source into the housing and against said opposite surFace of the nonrotatable bearing element, the housing forming conjointly with said non-rotatable bearing element a cylinder-piston arrangement (23, 24); and pressure fluid conduction means (27, 55) including choke means (55) formed in the pressure fluid conducting means extending in axial direction through said ring-shaped nonrotatable bearing element (23, 52) and introducing pressure fluid between the transverse surface of the rotatable bearing element and one facing surface of the non-rotatable bearing element to provide for axial counter pressure and unloading force acting on the roller bearing.
Claim 3
Dependent Claim
24 words
Apparatus according to claim 1, including a relief pocket (28, 57) formed in a facing axially directed surface of one of said bearing elements.
Claim 4
Dependent Claim
64 words
Apparatus according to claim 1, wherein the non-rotatable bearing element (23, 52) comprises a stator ring (23, 52); said housing and said stator ring being shaped to form said cylinder-piston arrangement, said stator ring forming the cylinder components of said cylinder-piston arrangement, the other component being formed by the housing (2, 43), said stator ring being separated from the rotatable element by hydrostatic force.
Claim 5
Dependent Claim
27 words
Apparatus according to claim 1, wherein the piston of the cylinder-piston arrangement is a ring projecting in axial direction between the housing and said non-rotatable bearing element.
Claim 6
Dependent Claim
13 words
Apparatus according to claim 1, wherein a plurality of cylinder-piston arrangements are provided.
Claim 7
Dependent Claim
47 words
Apparatus according to claim 1, wherein the rolling contact bearing means (5) is formed with an inner race (22) rotating with said shaft (4); and said rotating bearing element (21) of the hydrostatic bearing rotatable with the shaft (4) is axially supported against said inner race (22).
Claim 8
Dependent Claim
85 words
Apparatus according to claim 1, wherein the cylinder unit (41) is rotatable and has an end face; the rotatable bearing element (51) of the slide bearing (20'') is formed by the end face of the cylinder unit; and wherein the ring-shaped non-rotatable bearing element (52) of the slide bearing is a ring-shaped member which has a facing surface opposite the end face of the cylinder unit, said housing (43) and ring-shaped bearing element (52) having overlapping, interengaging portions (53) to form a stepped cylinder-piston arrangement.
Claim 9
Dependent Claim
28 words
Apparatus according to claim 1, wherein the slide bearing (20'''') is located beyond the roller contact bearing means (50) retaining and guiding the shaft (40) in the housing.
Claim 10
Dependent Claim
36 words
Apparatus according to claim 1, including auxiliary spring means (31) separating the non-rotatable element (23) slightly, in axial direction, from the rotating element (21), said spring means bearing against said non-rotatable element and against the housing.
Claim 11
Dependent Claim
31 words
Apparatus according to claim 1, wherein the non-rotatable element (23, 52) of the hydrostatic axial bearing is slightly axially movable in the housing and located therein to be guided axially thereby.
Claim 12
Dependent Claim
47 words
Apparatus according to claim 10, wherein an axially extending chamber is formed between said opposite surface of the non-rotatable element and the housing, and separating said non-rotatable element and the housing, said chamber, the adjacent portion of the housing and the non-rotatable element forming said piston-cylinder arrangement.
Claim 13
Dependent Claim
26 words
Apparatus according to claim 11, wherein the pressure fluid conduction means comprises at least one opening formed in said axially movable element communicating with said chamber.
Claim 14
Dependent Claim
48 words
Apparatus according to claim 12, wherein the means introducing pressure fluid from said source into the housing are connected into said chamber, said at least one opening supplying hydraulic fluid, under pressure, from the chamber to the region between the rotatable element and the slightly axially movable element.
References Cited (Backward Citations)
US2525979A
Cited
US2941853A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |