US3890066A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Axially and radially compensated high pressure gear pump
Assignee: Individual
•
Filing: 1974-03-18
•
Granted: 1975-06-17
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Expires: 1994-03-18
Abstract
Abstract An axially and radially pressure compensated internally-geared high pressure gear pump in which the filler member is commashaped and abutted against a large supporting pin under operating pressure, the abutment position being maintained under dry run conditions by an elastically deformed pin biasing the filler member against the supporting pin, while allowing for radial adjustments of the filler member position.
Inventors
- 👤 Otto Eckerle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:19
CPC Classifications
F; F04; F04C; F04C15/00; F04C15/0003; F04C15/0007; F04C15/0019; F04C2/00; F04C2/08; F04C2/10; F04C2/101
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
141 words
In a high pressure gear pump of the internally-geared type having a pinion, a cooperating gear ring, and a radially displaceable filler member arranged in the main bore of the pump housing, with a radially pressure-compensated control piston biasing the gear ring radially toward the pinion and the filler member, and with axially pressure-compensated discs bearing against the axial flanks of the pinion and gear ring in at least the area of pressure generation, the combination of: means for abutting the filler member relative to the pump housing against back movement in the rotational direction opposed to the direction of gear rotation, while permitting a small radial displacement of the filler member; and mechanical spring-biasing means engaging the filler member for biasing the latter toward said abutting means in said abutment direction, while permitting said radial displacement of the filler member.
Claim 2
Dependent Claim
141 words
In a high pressure gear pump of the internally-geared type having a pinion, a cooperating gear ring, and a radially displaceable filler member arranged in the main bore of the pump housing, with a radially pressure-compensated control piston biasing the gear ring radially toward the pinion and the filler member, and with axially pressure-compensated discs bearing against the axial flanks of the pinion and gear ring in at least the area of pressure generation, the combination of: means for abutting the filler member relative to the pump housing against back movement in the rotational direction opposed to the direction of gear rotation, while permitting a small radial displacement of the filler member; and mechanical spring-biasing means engaging the filler member for biasing the latter toward said abutting means in said abutment direction, while permitting said radial displacement of the filler member.
Claim 3
Dependent Claim
55 words
A combination as defined in claim 1, wherein: the filler member biasing means is a bendable, relatively thin elastic pin extending axially through the filler member and into the axial discs; the axial discs include means for positioning the extremities of said pin; and the pump housing includes means for rotationally positioning the axial discs.
Claim 4
Dependent Claim
68 words
A combination as defined in claim 1, wherein: the filler member is comma-shaped in its general cross-sectional outline, having a substantially flat end face at its wider extremity oriented in said abutment direction; the filler member abutting means is a rigid abutment pin mounted in the pump housing and extending axially across its bore in the space between the toothed peripheries of the pinion and internal gear ring.
Claim 5
Dependent Claim
36 words
A combination as defined in claim 3, wherein: said abutment pin is cylindrical and has a peripheral portion of its cross section removed to form an abutment face for engagement with said filler member end face.
Claim 6
Dependent Claim
47 words
A combination as defined in claim 4, wherein: the abutment face on the abutment pin and the cooperating end face of the filler member form a plane of abutment which is substantially perpendicular to the direction of control piston bias against the gear ring anD filler member.
Claim 7
Dependent Claim
129 words
A combination as defined in claim 4, wherein: the pinion has a bearing portion adjacent its axial flanks; the axial discs have a shape which includes an inner radius portion engaging said pinion bearing portion and an outer radius portion which is engaged by the control piston for radially inwardly abutting the latter; the control piston has two axially extending shoulder portions for said abutting engagement with the axial discs; and the radial height of the abutment face on the abutment pin in relation to the mounting location of the pin in the housing is such that the control piston compensation pressure is distributed between, and born by said pinion bearing portion, via the axial discs, and the pinion teeth, via the gear ring and the comma-shaped filler member.
Claim 8
Dependent Claim
124 words
A combination as defined in claim 1, wherein: the filler member biasing means is a bendable, relatively thin elastic pin extending axially through the filler member and through the axial discs into the pump housing on both sides of the gears; the pump housing includes means for positioning the extremities of said pin; and the filler member includes an axial bore for said elastic pin, said bore being offset in relation to said pin positioning means in such a way as to require biasing deflection of the pin away from said abutment direction, said bore further being enlarged to accommodate said deflection and to allow a small displacement of the filler wedge in the radial direction, without affecting the operation of the biasing means.
Claim 9
Dependent Claim
40 words
A combination as defined in claim 7, wherein: said pin positioning means in the pump housing is in the form of two elongated recesses permitting radial shifting of the elastic pin in conformance with radial displacements of the filler member.
Claim 10
Dependent Claim
51 words
A combination as defined in claim 7, wherein: said pin positioning means in the pump housing is in the form of hollow positioning pins which also serve to rotationally position the axial discs, the positioning pins having an enlarged outer bore portion to accommodate the biasing deflection of the elastic pin.
Claim 11
Dependent Claim
18 words
A combination as defined in claim 7, wherein: said elastic pin is a length of spring steel rod.
References Cited (Backward Citations)
US3289599A
Cited
US3525580A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-06-16 | 1978-12-16 | 1979-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-06-16 | 1982-12-16 | 1983-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-06-16 | 1986-12-16 | 1987-06-17 | $7700.00 | Window Closed / Lapsed |