US4272993A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically controlled differential
Assignee: Motors Liquidation Co
•
Filing: 1978-10-11
•
Granted: 1981-06-16
•
Expires: 1998-10-11
Abstract
Abstract A planetary gear differential has a pair of side gears and two pairs of composite planet gears rotatably carried by a rotatable carrier. Each pair of composite planet gears includes meshing impeller gears and drive gears meshing respective side gears. Hydraulic control means for limiting the differential speed of the side gears comprises two closed hydraulic circuits located in the carrier. Each circuit includes a gear pump chamber having the meshing impeller gears of one pair of composite planet gears disposed therein, and a pair of opposed unidirectional restrictions located in conduits leading from opposite radial sides of the gear pump chamber to an inner annular sump common to both circuits.
Inventors
- 👤 Leonard F. Kopich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 20:21
CPC Classifications
F; F16; F16H; F16H48/00; F16H48/06; F16H48/10; F16H48/11; F16H48/20; F16H48/27
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
86 words
In a planetary gear differential having a pair of side gears, a pair of composite planet gears rotatably carried by a rotatable carrier, said pair of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a closed hydraulic circuit including a gear pump chamber having the meshing impeller gears disposed therein, and a pair of opposed unidirectional restrictions located on opposite sides of the gear pump chamber.
Claim 2
Dependent Claim
86 words
In a planetary gear differential having a pair of side gears, a pair of composite planet gears rotatably carried by a rotatable carrier, said pair of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a closed hydraulic circuit including a gear pump chamber having the meshing impeller gears disposed therein, and a pair of opposed unidirectional restrictions located on opposite sides of the gear pump chamber.
Claim 3
Dependent Claim
95 words
In a planetary gear differential having a pair of side gears, a pair of composite planet gears rotatably carried by a rotatable carrier, said pair of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a closed hydraulic circuit in the carrier including a gear pump chamber having the meshing impeller gears disposed therein, and a pair of opposed unidirectional restrictions located in conduits leading from opposite sides of the gear pump chamber to a sump.
Claim 4
Dependent Claim
95 words
In a planetary gear differential having a pair of side gears, a pair of composite planet gears rotatably carried by a rotatable carrier, said pair of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a closed hydraulic circuit in the carrier including a gear pump chamber having the meshing impeller gears disposed therein, and a pair of opposed unidirectional restrictions located in conduits leading from opposite sides of the gear pump chamber to a sump.
Claim 5
Dependent Claim
101 words
In a planetary gear differential having a pair of side gears, associated pairs of composite planet gears rotatably carried by a rotatable carrier, each of said pairs of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a plurality of closed hydraulic circuits each including a gear pump chamber having the meshing impeller gears of one of the associated pairs of composite planet gears disposed therein, and a pair of opposed unidirectional restrictions located on opposite sides of the gear pump chamber.
Claim 6
Dependent Claim
101 words
In a planetary gear differential having a pair of side gears, associated pairs of composite planet gears rotatably carried by a rotatable carrier, each of said pairs of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a plurality of closed hydraulic circuits each including a gear pump chamber having the meshing impeller gears of one of the associated pairs of composite planet gears disposed therein, and a pair of opposed unidirectional restrictions located on opposite sides of the gear pump chamber.
Claim 7
Dependent Claim
120 words
In a planetary gear differential having a pair of side gears, associated pairs of composite planet gears rotatably carried by a rotatable carrier, each of said pairs of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a plurality of closed hydraulic circuits in the carrier, each including a gear pump chamber having the meshing impeller gears of one of the associated pairs of composite planet gears disposed therein, and a pair of opposed unidirectional restrictions located in conduits leading from opposite radial sides of the gear pump chamber to an inner annular sump which is common to all hydraulic circuits.
Claim 8
Dependent Claim
120 words
In a planetary gear differential having a pair of side gears, associated pairs of composite planet gears rotatably carried by a rotatable carrier, each of said pairs of composite planet gears including meshing impeller gears and drive gears meshing respective side gears, improved hydraulic control means for limiting the differential speed of the side gears comprising: a plurality of closed hydraulic circuits in the carrier, each including a gear pump chamber having the meshing impeller gears of one of the associated pairs of composite planet gears disposed therein, and a pair of opposed unidirectional restrictions located in conduits leading from opposite radial sides of the gear pump chamber to an inner annular sump which is common to all hydraulic circuits.
References Cited (Backward Citations)
US1229548A
Cited
US2400728A
Cited
US3015970A
Cited
US2949792A
Cited
US3034322A
Cited
US3232139A
Cited
US3229550A
Cited
US3251244A
Cited
US3375735A
Cited
US3393583A
Cited
US3590954A
Cited
US3724289A
Cited
US3831461A
Cited
US4041804A
Cited
US4084654A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-15 | 1984-12-15 | 1985-06-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-15 | 1988-12-15 | 1989-06-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-15 | 1992-12-15 | 1993-06-16 | $7700.00 | Window Closed / Lapsed |