Patent US5926431A successfully refreshed from Google Patents.
Patent US4258588A successfully refreshed from Google Patents.
US4258588A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Differential transmission with limited torque transmitter
Assignee: Individual
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Filing: 1979-03-16
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Granted: 1981-03-31
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Expires: 1999-03-16
Abstract
Abstract A differential transmission including a rotatable casing, a pair of pinion gears coupled to the casing, a pair of side gears engaged with the pinion gears, a pair of wheel axles engaged with the side gears, and a limited torque transmitter, in the form of a rotary pump, which pumps the transmission fluid. The torque transmitter develops internal torsional resistance only when the differential speed ratio of the axles exceeds a predetermined value, such as when one wheel slips.
Inventors
- 👤 Robert S. Yum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:07
CPC Classifications
F; F16; F16H; F16H48/00; F16H48/20; F16H48/27; F16H48/06; F16H48/08; F16H2048/085; G; G11; G11B; G11B20/00; G11B20/00086; G11B20/0021; G11B20/00217; G11B20/00224; G11B20/00231
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
198 words
A differential transmission for controlling the rotational speed of a pair of wheels, comprising: (a) a first rotatable casing having a pair of hubs; (b) a pair of pinion gears coupled to said first casing: (c) a pair of side gears having openings therethrough and being in meshing engagement with said pinion gears; (d) a pair of wheel axles extending, respectively, through said hubs and into said openings in meshing engagement with said side gears; and (e) a rotary pump including a second rotary casing forming a pair of fluid cylinders and having a first fluid inlet and a first fluid outlet in fluid communication with one of said cylinders, a second fluid inlet and a second fluid outlet in fluid communication with the other of said cylinders, a rotary shaft having a pair of blades, one of said blades extending within said one cylinder and the other of said blades extending within said other cylinder, said second casing extending into one of said openings and being in meshing engagement with one of said side gears and said shaft extending into the other of said openings and being in meshing engagement with the other of said side gears.
Claim 2
Dependent Claim
198 words
A differential transmission for controlling the rotational speed of a pair of wheels, comprising: (a) a first rotatable casing having a pair of hubs; (b) a pair of pinion gears coupled to said first casing: (c) a pair of side gears having openings therethrough and being in meshing engagement with said pinion gears; (d) a pair of wheel axles extending, respectively, through said hubs and into said openings in meshing engagement with said side gears; and (e) a rotary pump including a second rotary casing forming a pair of fluid cylinders and having a first fluid inlet and a first fluid outlet in fluid communication with one of said cylinders, a second fluid inlet and a second fluid outlet in fluid communication with the other of said cylinders, a rotary shaft having a pair of blades, one of said blades extending within said one cylinder and the other of said blades extending within said other cylinder, said second casing extending into one of said openings and being in meshing engagement with one of said side gears and said shaft extending into the other of said openings and being in meshing engagement with the other of said side gears.
Claim 3
Dependent Claim
43 words
A differential transmission according to claim 1 wherein said first outlet and said second outlet are sized to build up fluid pressure in said first cylinder and said second cylinder, respectively, only after a predetermined differential speed ratio occurs between said wheel axles.
Claim 4
Dependent Claim
26 words
A differential transmission according to claim 2 wherein said first inlet and said second inlet are larger than said first outlet and said second outlet, respectively.
Claim 5
Dependent Claim
38 words
A differential transmission according to claim 3 wherein said first inlet and said first outlet are positioned oppositely with respect to said second inlet and said second outlet in relation to the direction of rotation of said shaft.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-03-30 | 1984-09-29 | 1985-03-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-30 | 1988-09-29 | 1989-03-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-30 | 1992-09-29 | 1993-03-31 | $7700.00 | Window Closed / Lapsed |