Multi-speed transmission
AssigneeFord Global Technologies, LLC
InventorsRobert Scott Lippert, Jeremy Lynn Hargis
Life of this patent
Estimating the term…
Abstract
Transmissions with at least three gearing-arrangements with similar first and second gearing-arrangements that produce a number of transmissions having an eleven forward-speed and two reverse-speed ratios, having ten forward-speed and three reverse-speed ratios, and having five forward-speed and one reverse-speed ratios by selective engagement of three shift-elements in various combinations. Some embodiments include four simple planetary-gearsets and six shift-elements of which two or three are brakes. Another embodiment includes a double-pinion planetary-gearset and six shift-elements of which three are brakes. Other embodiments include three simple planetary-gearsets and five shift-elements of which one or two are brakes.
Claims27
A transmission comprising:
- a first gearing-arrangement configured to impose a linear speed relationship among an output-shaft, a first-shaft, and a second-shaft;
- a second gearing-arrangement configured to impose a linear speed relationship among an input-shaft, a third-shaft, and a fourth-shaft;
- a first-clutch configured to selectively couple the input-shaft to the first-shaft;
- a second-clutch configured to selectively couple the first-shaft to the third-shaft;
- a third-clutch configured to selectively couple the second-shaft to the third-shaft;
- and
- a first-brake configured to selectively hold the first-shaft against rotation.
A transmission comprising:
- a first planetary-gearset connecting an output-shaft, a first-shaft, and a second-shaft;
- a second planetary-gearset connecting an input-shaft, a third-shaft, and a fourth-shaft;
- a third planetary-gearset connecting at least one of the second-shaft and the fourth-shaft;
- a first-clutch coupling the input-shaft to the first-shaft;
- a second-clutch coupling the first-shaft to the third-shaft;
- a third-clutch coupling the second-shaft to the third-shaft;
- and
- a first-brake on the first-shaft.
A transmission comprising:
- an output-shaft associated with a first end-gear of a first planetary-gearset;
- an input-shaft associated with a second end-gear of a second planetary-gearset;
- and
- a third and fourth planetary-gearset inter-associated by two shafts, wherein at least one of the two shafts is associated with at least one of the first and second planetary-gearsets.
Dependencies are inferred from the claim text.