US3680990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable liner for gear pump
Assignee: Vickers Inc
•
Filing: 1971-04-30
•
Granted: 1972-08-01
•
Expires: 1991-04-30
Abstract
Abstract A hydraulic pump of the intermeshing spur gear type has a onepiece liner for the gear cavity in the body. The liner is a Cshaped piece of resilient metal coated with bearing material and in its free state, is larger than the cavity and requires elastic compression to be inserted therein. The inlet passage is formed with three branches for improved filling at high speeds.
Inventors
- 👤 Raymond B Pettibone
- 👤 Albin J Niemiec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:14
CPC Classifications
F; F04; F04C; F04C2/00; F04C2/08; F04C2/12; F04C2/14; F04C2/18; F04C2/082; F04C2/086; F04C2240/00; F04C2240/80; F04C2240/802; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49229; Y10T29/49236; Y10T29/49242
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
112 words
A hydraulic pump comprising a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the liner having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
Claim 2
Dependent Claim
112 words
A hydraulic pump comprising a body having an ovoid cavity, a pair of intermeshing gears mounted to rotate in the cavity, inlet and outlet passages in the body, the inlet passage being branched to enter the cavity at the end faces of the gears, and a liner for the ovoid surface of the cavity comprising a single piece of resilient sheet material extending in contact with the tooth peripheries of both gears and across the area adjacent the inlet, but having free ends providing an opening adjacent the outlet, the liner having a preformed free shape larger than the cavity and being elastically compressed at its free ends to fit the cavity.
Claim 3
Dependent Claim
26 words
A pump as defined in claim 1 wherein the liner is formed of sheet steel having an adherent layer of bearing material on its inner surface.
Claim 4
Dependent Claim
14 words
A pump as defined in claim 2 wherein the layer is an aluminum alloy.
Claim 5
Dependent Claim
36 words
A pump as defined in claim 1 wherein the inlet passage includes a third branch extending perpendicular to the plane containing the gear axes and entering the cavity midway between the end faces of the gears.
Claim 6
Dependent Claim
28 words
A pump as defined in claim 4 wherein the liner contains shallow depressions extending from the end of the third inlet branch in the direction of gear rotation.
Claim 7
Dependent Claim
17 words
A pump as defined in claim 5 wherein the depressions are progressively shallower toward their distant ends.
References Cited (Backward Citations)
US1339565A
Cited
US1686867A
Cited
US1982027A
Cited
US1927395A
Cited
US2697987A
Cited
US2966860A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-01 | 1976-01-31 | 1976-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-01 | 1980-01-31 | 1980-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-01 | 1984-01-31 | 1984-08-01 | $7700.00 | Window Closed / Lapsed |