US4538977A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller vane pump with angular ranges of approximate concentric circular paths for the rollers
Assignee: Robert Bosch GmbH
•
Filing: 1985-01-14
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Granted: 1985-09-03
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Expires: 2005-01-14
Abstract
Abstract A fluid supply pump such as a roller cell pump which includes a multiplicity of individual pumping bodies or rollers held in the grooves of a driven rotor in contact with an eccentrically disposed roller path which, in a certain angular range around the narrowest and widest gap, it is, at each location, virtually identical with a concentric circular path which is drawn around the rotor center point, the path preferably formed by two ellipse halves, for the elliptic shape can be virtually exactly approximated around the apex points of the ellipse by means of its primary circles of curvature to thereby improve the dynamic sequence of operations, for example to increase the sealing effect of the radial gap and to adapt the expansion and compression phases to the opening and closing conditions of the intake and pressure grooves.
Inventors
- 👤 Karl Ruhl
- 👤 Ulrich Kemmner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:26
CPC Classifications
F; F01; F01C; F01C21/00; F01C21/10; F01C21/104; F01C21/106; F04; F04C; F04C2/00; F04C2/30; F04C2/34; F04C2/344; F04C2/3441; F04C2/3445; F04C2250/00; F04C2250/30; F04C2250/301
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
167 words
A supply unit for fluids, in particular a fuel supply pump in the form of a roller cell or vane cell pump which is disposed in a common housing with a driving electromotor comprising, in combination, a driven rotor disc having a plurality of grooves, a plurality of individual pumping rollers disposed in said rotor disc grooves, a roller path formed by two ellipse halves having the same geometrical center Me disposed eccentrically to said disc for contact by said rollers, the major semi-axis of one ellipse half being identical to the minor semi-axis of the other ellipse half, whereby the ellipse shape about the apex points WS and ES of said ellipse halves approximate circular arcs of curvature with centers coinciding with said rotor disc, said roller path within an angular range of ±20° about the narrowest and widest gap distances at the apex of said ellipical halves being substantially identical in each area with a concentric circular path about the center of said rotor path.
Claim 2
Dependent Claim
167 words
A supply unit for fluids, in particular a fuel supply pump in the form of a roller cell or vane cell pump which is disposed in a common housing with a driving electromotor comprising, in combination, a driven rotor disc having a plurality of grooves, a plurality of individual pumping rollers disposed in said rotor disc grooves, a roller path formed by two ellipse halves having the same geometrical center Me disposed eccentrically to said disc for contact by said rollers, the major semi-axis of one ellipse half being identical to the minor semi-axis of the other ellipse half, whereby the ellipse shape about the apex points WS and ES of said ellipse halves approximate circular arcs of curvature with centers coinciding with said rotor disc, said roller path within an angular range of ±20° about the narrowest and widest gap distances at the apex of said ellipical halves being substantially identical in each area with a concentric circular path about the center of said rotor path.
Claim 3
Dependent Claim
75 words
A supply unit in accordance with claim 1, wherein the radius of the approximate circular arc of curvature of the lower ellipse half corresponds to the radius of said rotor disc and wherein the radius of the approximate circular arc of curvature of the upper ellipse half is equal to the radius of said rotor disc plus the center point displacement between the center of said rotor disc and the center of said ellipse halves.
Claim 4
Dependent Claim
56 words
A supply unit in accordance with claim 2, wherein the radii (ρ 1 , ρ 2 ) of the two ellipse halves forming said roller path are a function of an angle (φ) whereby the two radii at two transition points are identical and have their center point in the center point of said rotor disc.
Claim 5
Dependent Claim
95 words
A supply unit in accordance with claim 1, wherein the radii (ρ 1 , ρ 2 ), expressed in polar coordinates having the center point in the center point of said rotor disc, of the roller path composed of two ellipse halves follows the following equations: ##EQU5## where ρ 1 lies between the limits of ##EQU6## where ρ 2 lies between the limits of ##EQU7## wherein R2 is the constant radius of said rotor disc and S2 is the distance of the ellipse center point (M E ) from the rotor disc center point (M).
Claim 6
Dependent Claim
49 words
A supply unit in accordance with claim 3, wherein in addition to the identity of the two radii (ρ 1 , ρ 2 ) at the transition of points, the slopes, that is, the first derivatives of the functions representing the curve, are also identical at said transition points.
Claim 7
Dependent Claim
94 words
A supply unit in accordance with claim 1 wherein radii (ρ 1 , ρ 2 ), expressed in polar coordinates having the center point in the center point of said rotor disc, of the roller path composed of two ellipse halves follows the following equations: ##EQU8## where ρ 1 lies between the limits of ##EQU9## where ρ 2 lies between the limits of ##EQU10## wherein R2 is the constant radius of said rotor disc and S2 is the distance of the ellipse center point (M E ) from the rotor disc center point (M).
Claim 8
Dependent Claim
94 words
A supply unit in accordance with claim 2 wherein radii (ρ 1 , ρ 2 ), expressed in polar coordinates having the center point in the center point of said rotor disc, of the roller path composed of two ellipse halves follows the following equations: ##EQU11## where ρ 1 lies between the limits of ##EQU12## where ρ 2 lies between the limits of ##EQU13## wherein R2 is the constant radius of said rotor disc and S2 is the distance of the ellipse center point (M E ) from the rotor disc center point (M).
Claim 9
Dependent Claim
94 words
A supply unit in accordance with claim 3 wherein radii (ρ 1 , ρ 2 ), expressed in polar coordinates having the center point in the center point of said rotor disc, of the roller path composed of two ellipse halves follows the following equations: ##EQU14## where ρ 1 lies between the limits of ##EQU15## where ρ 2 lies between the limits of ##EQU16## wherein R2 is the constant radius of said rotor disc and S2 is the distance of the ellipse center point (M E ) from the rotor disc center point (M).
References Cited (Backward Citations)
US27241A
Cited
US1271585A
Cited
GB313054A
Cited
GB527544A
Cited
GB534510A
Cited
GB541413A
Cited
US2359903A
Cited
CH348231A
Cited
GB816967A
Cited
US3247803A
Cited
USRE27241E
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-02 | 1989-03-04 | 1989-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-02 | 1993-03-04 | 1993-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-02 | 1997-03-04 | 1997-09-03 | $7700.00 | Window Closed / Lapsed |