US4398874A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gear ring pump
Assignee: Individual
•
Filing: 1981-06-30
•
Granted: 1983-08-16
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Expires: 2001-06-30
Abstract
Abstract A gear ring pump has a housing with an inner hollow and a suction and pressure side, a hollow gear arranged in the housing and provided with between eight and sixteen teeth, and a driven pinion provided with teeth having by one tooth less than the hollow gear and engaging with the hollow gear so as to form a region of deepest engagement and a region which is opposite to the latter. The teeth heads of the pinion slide over the teeth of the hollow gear in the opposite region whereas the driving teeth flanks of the pinion abut against the teeth of the hollow gear in the region of deepest engagement so as to provide sealing between the suction side and pressure side. The teeth are formed so that the teeth heads of the pinion are freely received into the teeth gaps of the hollow gear and the teeth of the pinion has a shape determined by rolling of the pinion over the hollow gear. The teeth of the hollow gear have an approximately trapezoidal shape with convexly curved flanks and heads.
Inventors
- 👤 Siegfried Eisenmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 06:30
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/082; F04C2/084
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
186 words
A gear ring pump, comprising a housing having an inner hollow and defining a suction side and a pressure side; a hollow gear arranged in said housing and provided with between eight and sixteen teeth; a driven pinion provided with further teeth having by one tooth less than said hollow gear and engaging with said hollow gear so as to form a region of deepest engagement and a region which is opposite to the latter, the teeth heads of said pinion sliding over the teeth of said hollow gear in the opposite region whereas the driving teeth flanks of said pinion abut against the teeth of said hollow gear in said region of deepest engagement so as to provide sealing between said suction side and pressure side, said teeth being formed so that the teeth heads of said pinion are freely received into the teeth gaps of said hollow gear and the teeth of said pinion has a shape determined by rolling of said pinion over said hollow gear, the teeth of said hollow gear having an approximately trapezoidal shape with convexly curved flanks and heads.
Claim 2
Dependent Claim
186 words
A gear ring pump, comprising a housing having an inner hollow and defining a suction side and a pressure side; a hollow gear arranged in said housing and provided with between eight and sixteen teeth; a driven pinion provided with further teeth having by one tooth less than said hollow gear and engaging with said hollow gear so as to form a region of deepest engagement and a region which is opposite to the latter, the teeth heads of said pinion sliding over the teeth of said hollow gear in the opposite region whereas the driving teeth flanks of said pinion abut against the teeth of said hollow gear in said region of deepest engagement so as to provide sealing between said suction side and pressure side, said teeth being formed so that the teeth heads of said pinion are freely received into the teeth gaps of said hollow gear and the teeth of said pinion has a shape determined by rolling of said pinion over said hollow gear, the teeth of said hollow gear having an approximately trapezoidal shape with convexly curved flanks and heads.
Claim 3
Dependent Claim
39 words
A gear ring pump as defined in claim 1, wherein said hollow gear has a rolling circle substantially coinciding with its theoretical teeth roots circle, said pinion having a roller circle substantially coinciding with its theoretical teeth head circle.
Claim 4
Dependent Claim
48 words
A gear ring pump as defined in claim 1, wherein the teeth and the teeth gaps of said hollow gear extend in a circumferential direction along a circle at the half height of the teeth of said hollow gear, by distances which are substantially equal to one another.
Claim 5
Dependent Claim
70 words
A gear ring pump as defined in claim 1, wherein said hollow gear has a predetermined theoretical teeth height, said hollow gear having a teeth heads width without rounding which is equal to between 0.65 and 0.7 of the theoretical teeth height, and a width of the teeth gaps at its theoretical root circle without the rounding which is equal to between 1.05 and 1.1 of the theoretical teeth height.
Claim 6
Dependent Claim
52 words
A gearing ring pump as defined in claim 1, wherein said hollow gear has a predetermined theoretical teeth height, the teeth of said hollow gear having a radius of curvature of the teeth heads which is equal to substantially between 2 and 2.4 of the theoretical teeth height of said hollow gear.
Claim 7
Dependent Claim
38 words
A gear ring pump as defined in claim 5, wherein said radius of curvature of the teeth heads of said hollow gear is equal to between 2.2 and 2.3 of the theoretical teeth height of said hollow gear.
Claim 8
Dependent Claim
53 words
A gear ring pump as defined in claim 1, wherein said hollow gear has a predetermined theoretical teeth height, the teeth flanks of said hollow gear having a radius of curvature of the teeth flanks which is equal to substantially between 3.3 and 3.7 of the theoretical teeth height of said hollow gear.
Claim 9
Dependent Claim
38 words
A gear ring pump as defined in claim 7, wherein said radius of curvature of the teeth flanks of said hollow gear is equal to between 3.4 and 3.6 of the theoretical teeth height of said hollow gear.
Claim 10
Dependent Claim
80 words
A gear ring pump as defined in claim 1, wherein said hollow gear has a predetermined teeth roots circle, the convexly curved heads of said hollow gear extending along a circular arc with a center which is located at a radius line extending through a teeth center line and is outside of the teeth root circle, the teeth flanks of said hollow gear extending along circular arcs with a center which is also located outside of the teeth root circle.
Claim 11
Dependent Claim
37 words
A gear ring pump as defined in claim 1, wherein the teeth flanks which face away from one another and are formed at two neighboring teeth of said hollow gear are located at a common circular arc.
Claim 12
Dependent Claim
73 words
A gear ring pump as defined in claim 1, wherein said hollow gear has a predetermined theoretical teeth height, said hollow gear having edges between the teeth flanks and the teeth heads, the edges being rounded along circular arcs which gradually merge into arcs defining the teeth flanks and into arcs defining the teeth heads and have a radius substantially corresponding to one third of the theoretical teeth height of said hollow gear.
Claim 13
Dependent Claim
25 words
A gear ring pump as defined in claim 1, wherein said pinion has teeth gaps with a bottom which is worked in a free manner.
Claim 14
Dependent Claim
19 words
A gear ring pump as defined in claim 1, wherein said hollow gear has between nine and fifteen teeth.
Claim 15
Dependent Claim
19 words
A gear ring pump as defined in claim 13, wherein said hollow gear has between ten and thirteen teeth.
Claim 16
Dependent Claim
20 words
A gear ring pump as defined in claim 1; and further comprising a driving shaft arranged to drive said pinion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-08-15 | 1987-02-14 | 1987-08-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-08-15 | 1991-02-14 | 1991-08-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-08-15 | 1995-02-14 | 1995-08-16 | $7700.00 | Window Closed / Lapsed |