Compound planetary front wheel drive continuously variable transmission
AssigneeGM Global Technology Operations LLC
InventorsScott William Heitzenrater, Edwin T. Grochowski
Life of this patent
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Abstract
The present invention provides an automatic transmission for a motor vehicle having a compact single mode transfer gear continuously variable transmission (CVT) with a compound planetary gear carrier for use in front wheel drive vehicles. The automatic transmission includes an input shaft, a variator or other, similar device which provides a continuously variable input to output speed ratio over a limited range, a compound planetary gear assembly having a sun gear, a planet gear carrier with compound gear sets and a ring gear, a friction brake, a friction clutch and a plurality of transfer gears and layshafts.
Claims18
A transmission for a motor vehicle comprising, in combination,
- an input member,
- an output member,
- a variator having an input coupled to said input member and an output,
- a first transfer gear set having a first gear coupled to said output of said variator and a second gear,
- a planetary gear assembly having a first element, a second element and a third element,
- a friction brake coupled to one of said elements of said planetary gear assembly, another of said elements of said planetary gear assembly coupled to said second gear of said first transfer gear set,
- a second transfer gear set having a first gear coupled to yet another element of said planetary gear assembly and a second gear operably driving said output member, and
- a friction clutch disposed between said first gear of said second transfer gear set and said another of said elements of said planetary gear assembly.
A transmission for a motor vehicle comprising, in combination,
- an input member,
- an output member,
- a variator having an input coupled to and driven by said input member and an output,
- a first transfer gear set having a first gear coupled to and driven by said output of said variator and a second gear,
- a planetary gear assembly having a first element, a second element and a third element,
- a friction brake coupled to one of said elements of said planetary gear assembly, another of said elements of said planetary gear assembly coupled to said second gear of said first transfer gear set,
- a second transfer gear set having a first gear coupled to yet another element of said planetary gear assembly and a second gear,
- a friction clutch operably disposed between said first gear of said second transfer gear set and said another of said elements of said planetary gear assembly, and
- a third transfer gear set having a first gear coupled to said second gear of said second transfer gear set and a second gear coupled to and driving said output member.
An automatic transmission for a motor vehicle comprising, in combination,
- an input shaft,
- an output shaft,
- a variator having an input coupled to and driven by said input member and an output,
- a first transfer gear set having a first gear coupled to and driven by said output of said variator and a second gear,
- a planetary gear assembly having a sun gear, a planet gear carrier having a plurality of pairs of meshing planet gears and a ring gear,
- a friction brake coupled to said ring gear of said planetary gear assembly, said planet gear carrier of said planetary gear assembly coupled to said second gear of said first transfer gear set,
- a second transfer gear set having a first gear coupled to said sun gear of said planetary gear assembly and a second gear operably driving said output shaft, and
- a friction clutch disposed between said first gear of said second transfer gear set and said planet gear carrier of said planetary gear assembly.
Dependencies are inferred from the claim text.