Patent US5588852A successfully refreshed from Google Patents.
Patent US3918855A successfully refreshed from Google Patents.
US3918855A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Adjustable vane pump
Assignee: Bosch Rexroth AG
•
Filing: 1974-08-01
•
Granted: 1975-11-11
•
Expires: 1994-08-01
Abstract
Abstract A vane pump wherein an annular slide block which surrounds the vanes of the rotor is movable radially of the rotor axis by two plungers which are mounted in the housing diametrically opposite each other. An arresting plug abuts against the slide block midway between the plungers at the higher-pressure side of the rotor and has a flat or spherical contact surface engaging the external surface of the slide block. The outer end of the plug has a socket for the major portion of a ball which bears against the concave surface of an abutment mounted in a recess of a screw which meshes with the housing and is movable radially of the rotor. The radius of curvature of the concave surface exceeds the radius of the ball and the radius of curvature of the contact surface, as considered in the direction of adjustment of the slide block by the plungers, exceeds the distance from the locus of contact between the ball and abutment to the locus of contact between the plug and slide block. This insures that the external surface of the slide block rolls along the contact surface and does not slide with respect to the plungers when the slide block is shifted by the plungers whereby the amount of fluid which is displaced by the vanes can be changed without vibrations and/or hysteresis. Adjustments of the screw relative to the housing serve to change the noise level of the pump.
Inventors
- 👤 Siegfried Bornholdt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:56
CPC Classifications
F; F04; F04C; F04C14/00; F04C14/18; F04C14/22; F04C14/223
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
255 words
In a hydraulic machine, particularly in a vane pump, a combination comprising a housing; a rotor mounted in said housing; an annular slide block located in said housing and spacedly surrounding said rotor, said slide block having endless internal and external surfaces; liquid displacing elements mounted in said rotor for movement substantially radially of the rotor axis and abutting against said internal surface, at least while said rotor is driven; and an adjustment mechanism for said slide block, including at least one adjusting member abutting against said external surface and movable in said housing in a predetermined direction substantially radially of said rotor to thereby change the distance between the aXes of said slide block and said rotor, an arresting member angularly offset from said adjusting member by less than 180*, as considered in the circumferential direction of said rotor, and having a contact surface abutting against said external surface, said contact surface being flat or convex, as considered in said predetermined direction, an adjustable abutment member located in said housing radially outwardly of said arresting member, and a spherical insert interposed between said abutment member and said arresting member, said abutment member having a concave surface which is engaged by said spherical insert and having a radius of curvature greater than the radius of said insert, the distance from the locus of contact between said abutment member and said insert to the locus of contact between said contact surface and said external surface being less than the radius of curvature of said contact surface.
Claim 2
Dependent Claim
255 words
In a hydraulic machine, particularly in a vane pump, a combination comprising a housing; a rotor mounted in said housing; an annular slide block located in said housing and spacedly surrounding said rotor, said slide block having endless internal and external surfaces; liquid displacing elements mounted in said rotor for movement substantially radially of the rotor axis and abutting against said internal surface, at least while said rotor is driven; and an adjustment mechanism for said slide block, including at least one adjusting member abutting against said external surface and movable in said housing in a predetermined direction substantially radially of said rotor to thereby change the distance between the aXes of said slide block and said rotor, an arresting member angularly offset from said adjusting member by less than 180*, as considered in the circumferential direction of said rotor, and having a contact surface abutting against said external surface, said contact surface being flat or convex, as considered in said predetermined direction, an adjustable abutment member located in said housing radially outwardly of said arresting member, and a spherical insert interposed between said abutment member and said arresting member, said abutment member having a concave surface which is engaged by said spherical insert and having a radius of curvature greater than the radius of said insert, the distance from the locus of contact between said abutment member and said insert to the locus of contact between said contact surface and said external surface being less than the radius of curvature of said contact surface.
Claim 3
Dependent Claim
21 words
A combination as defined in claim 1, wherein said arresting member is angularly offset from said adjusting member by substantially 90*.
Claim 4
Dependent Claim
36 words
A combination as defined in claim 1, further comprising means for moving said abutment member radially of said rotor, said means for moving having a recess for said insert and a portion of said arresting member.
Claim 5
Dependent Claim
61 words
A combination as defined in claim 1, wherein said displacing elements are vanes defining with said slide block a plurality of variable-volume liquid-containing chambers including a first group of chambers wherein the fluid pressure is lower and a second group of chambers wherein the fluid pressure is higher, said arresting member being located radially outwardly of said second group of chambers.
Claim 6
Dependent Claim
33 words
A combination as defined in claim 1, wherein said arresting member has a second surface located opposite said contact surface and having a socket receiving a portion of said insert with minimal clearance.
Claim 7
Dependent Claim
19 words
A combination as defined in claim 5, further comprising means for moving said abutment member radially of said rotor.
Claim 8
Dependent Claim
40 words
A combination as defined in claim 6, wherein said means for moving said abutment member comprises an externally threaded member meshing with said housing and being rotatable to thereby effect a movement of said abutment member radially of said rotor.
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) | 1978-11-10 | 1979-05-12 | 1979-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-10 | 1983-05-12 | 1983-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-10 | 1987-05-12 | 1987-11-11 | $7700.00 | Window Closed / Lapsed |