US4662240A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously variable transmission
Assignee: BTG International Ltd
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Filing: 1985-11-18
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Granted: 1987-05-05
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Expires: 2005-11-18
Abstract
Abstract A driveline for an engined vehicle, comprises a continuously-variable ratio transmission (1) having an input adapted to be driven by the engine and an output (3), a final drive shaft (8) for providing an output from the driveline, and means for driving the final drive shaft from the continuously-variable ratio transmission in either high or low regime. In low regime the final drive shaft is driven by the output (7) of an epicyclic (4) having first and second inputs (6,5) connected to be driven respectively by the said engine and by the said continuously-variable ratio transmission output and in high regime the final drive shaft is driven directly by the output (3) of the continuously-variable ratio transmission.
Inventors
- 👤 Christopher J. Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 09:29
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H2037/088; Y; Y10; Y10T; Y10T74/00; Y10T74/19; Y10T74/19219; Y10T74/19377; Y10T74/19414; Y10T74/19484; Y10T74/19488
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
A driveline for an engined vehicle, comprising a continuously-variable ratio transmission (1) having an input adapted to be driven by the engine and an output (3), a final drive shaft (8) for providing an output from the driveline, and means for driving the final drive shaft from the continuously-variable ratio transmission in either high or low regime, wherein in low regime the final drive shaft is driven by the output (7) of an epicyclic (4) having first and second inputs (6,5) connected to be driven respectively by the said engine and by the said continuously-variable ratio transmission output and in high regime the final drive shaft is driven directly by the output (3) of the continuously-variable ratio transmission.
Claim 2
Dependent Claim
118 words
A driveline for an engined vehicle, comprising a continuously-variable ratio transmission (1) having an input adapted to be driven by the engine and an output (3), a final drive shaft (8) for providing an output from the driveline, and means for driving the final drive shaft from the continuously-variable ratio transmission in either high or low regime, wherein in low regime the final drive shaft is driven by the output (7) of an epicyclic (4) having first and second inputs (6,5) connected to be driven respectively by the said engine and by the said continuously-variable ratio transmission output and in high regime the final drive shaft is driven directly by the output (3) of the continuously-variable ratio transmission.
Claim 3
Dependent Claim
38 words
A driveline as claimed in claim 1, wherein the said first and second inputs of the epicyclic comprise the planet carrier (6) and sun gear (5) respectively, the annulus (7) providing drive to the final drive shaft (8).
Claim 4
Dependent Claim
16 words
A driveline as claimed in claim 1, wherein the planet arrangement of the epicyclic is compound.
Claim 5
Dependent Claim
36 words
A driveline as claimed in claim 1, wherein the final drive shaft is driven, by the annulus in low regime and by the continuously-variable ratio transmission output in high regime, by means of gears (9, 10).
Claim 6
Dependent Claim
23 words
A driveline as claimed in claim 1, wherein the epicyclic ratio R=N A N C =O is in the range 2 to 3.
Claim 7
Dependent Claim
15 words
A driveline as claimed in claim 5, wherein the said ratio R is substantially 2.5.
Claim 8
Dependent Claim
32 words
A driveline as claimed in claim 1, wherein the drive ratio L between the said epicyclic and the final drive shaft in low regime forward is in the range -0.8 to -1.0.
Claim 9
Dependent Claim
15 words
A driveline as claimed in claim 7, wherein the drive ratio L is substantially -0.91.
Claim 10
Dependent Claim
35 words
A driveline as claimed in claim 1, wherein the drive ratio H between the output of the continuously-variable ratio transmission and the final drive shaft in high regime is in the range -1.0 to -1.2.
Claim 11
Dependent Claim
14 words
A driveline as claimed in claim 9, wherein the ratio H is substantially -1.11.
Claim 12
Dependent Claim
14 words
A driveline as claimed in claim 1, including reverse gearing (13) in low regime.
Claim 13
Dependent Claim
20 words
A driveline as claimed in claim 1, wherein the continuously-variable ratio transmission (1) is of the toroidal race-rolling traction type.
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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) | 1990-05-04 | 1990-11-03 | 1991-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-04 | 1994-11-03 | 1995-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-04 | 1998-11-03 | 1999-05-05 | $7700.00 | Window Closed / Lapsed |