EP0177241A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Continuously variable transmission
Assignee: Torotrak Development Ltd
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Filing: 1985-09-24
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Granted: —
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Expires: 2005-09-24
Abstract
Abstract 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) and first and second epicyclic gears (4, 10) for providing a high and low regime. The planet carrier (6) of the first epicyclic gear and the sun gear (12) of the second epicyclic gear are adapted to be driven by the said output of the continuously-variable ratio transmission, and the sun gear (5) of the first epicyclic gear and the annulus (11) of the second epicyclic gear are adapted to be driven by the engine, the annulus (7) of the first epicyclic gear providing an output in low regime, and the planet carrier (13) of the second epicyclic gear providing an output in high regime.
Inventors
- 👤 Christopher John Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-09 09:27
CPC Classifications
F; F16; F16H; F16H37/00; F16H37/02; F16H37/06; F16H37/08; F16H37/0833; F16H37/084; F16H37/086; F16H15/00; F16H15/02; F16H15/04; F16H15/06; F16H15/32; F16H15/36; F16H15/38; F16H2015/383; F16H2037/088
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 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) and first and second epicyclic gears (4, 10) for providing a high and low regime, wherein the planet carrier (6) of the first epicyclic gear and the sun gear (12) of the second epicyclic gear are adapted to be driven by the said output of the continuously- variable ratio transmission, and the sun gear (5) of the first epicyclic gear and the annulus (11) of the second epicyclic gear are adapted to be driven by the engine, the annulus (7) of the first epicyclic gear providing an output in low regime, and the planet carrier (13) of the second epicyclic gear providing an output in high regime.
Claim 2
Dependent Claim
133 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) and first and second epicyclic gears (4, 10) for providing a high and low regime, wherein the planet carrier (6) of the first epicyclic gear and the sun gear (12) of the second epicyclic gear are adapted to be driven by the said output of the continuously- variable ratio transmission, and the sun gear (5) of the first epicyclic gear and the annulus (11) of the second epicyclic gear are adapted to be driven by the engine, the annulus (7) of the first epicyclic gear providing an output in low regime, and the planet carrier (13) of the second epicyclic gear providing an output in high regime.
Claim 3
Dependent Claim
52 words
A driveline as claimed in claim 1, wherein the first and second epicyclic gears are mounted concentrically around an output shaft of the engine, which output shaft provides the drive for the input of the continuously-variable ratio transmission, the sun gear of the first epicyclic, and the annulus of the second epicyclic.
Claim 4
Dependent Claim
19 words
A driveline as claimed in any preceding claim, wherein the shift betwen high and low regime is made synchronously.
Claim 5
Dependent Claim
29 words
A driveline as claimed in any preceding claim, wherein the magnitude of the power transmitted through the variator at the shift between high and low regime remains substantially constant.
Claim 6
Dependent Claim
24 words
A driveline as claimed in any preceding claim, wherein the engine output shaft extends beyond the epicyclics, thereby to provide a power take off.
Claim 7
Dependent Claim
20 words
A driveline as claimed in any preceding claim, wherein the said first epicyclic is a positive ratio compound epicyclic gear.
Claim 8
Dependent Claim
18 words
A driveline as claimed in any preceding claim, wherein the said second epicyclic is a simple epicyclic gear.
Claim 9
Dependent Claim
24 words
A driveline as claimed in any preceding claim, including a reverse speed facility provided by a clutch and reverse gearing included in the driveline.
Claim 10
Dependent Claim
39 words
A driveline as claimed in any one of claims 1 to 10, wherein the variator output gearing in low regime is such as to provide a forward speed, neutral or a reverse speed in dependence upon the variator ratio.
Claim 11
Dependent Claim
20 words
A driveline as claimed in any preceding claim, wherein the continuously-variable ratio transmission is of the toroidal race-rolling traction type.
References Cited (Backward Citations)
No citation records indexed.
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